Imperialistic Power, or Liberating Nation?

01 · Framing

Framing the question as entities, not a verdict

“Was the United States an imperialistic power or a liberating nation between 1890 and 1920?” is not a question with a single correct one-word answer, and treating it that way flattens a period that genuinely contains evidence for both descriptions. A more useful approach is to separate the period into its constituent episodes, Cuba, the Philippines, Puerto Rico, Hawaii, Panama, China, and the Caribbean interventions under Taft and Wilson, and examine what the United States actually did in each case, rather than starting from a label and selecting facts to fit it.

The two terms themselves need definition before they can be applied. Imperialism, in the sense historians use for this period, describes the extension of one nation’s political, military, or economic control over another territory or people, whether through outright annexation, military occupation, or financial leverage that limits a nation’s practical sovereignty. Liberation, in the way American leaders of the period used the term, generally meant freeing a people from a prior colonial power, Spain above all, and helping establish the conditions for self-government. The historical record shows the United States doing recognizable versions of both at different moments, sometimes within the same policy, which is precisely why the debate has persisted among professional historians for more than a century rather than resolving itself.

Why this period specifically invites the comparison

No earlier period of U.S. history produced as concentrated a set of overseas territorial acquisitions and interventions as the three decades bridging the closing of the American frontier and the end of the First World War. In the space of a single year, 1898, the United States fought a war framed publicly as a war of liberation, annexed a Pacific kingdom by joint resolution, and purchased an entire Asian archipelago from a colonial power without the consent of the people living there. That density of events, several with sharply different characters, is exactly what makes a single verdict for the whole period difficult to sustain and a case-by-case approach worth the space it takes.

02 · Background

Why overseas expansion accelerated in the 1890s

The surge in American overseas activity after 1890 did not emerge from nowhere. It followed the closing of the continental frontier, a shift in naval strategic thinking, an economic depression that pushed industrialists toward foreign markets, and a set of racial and religious ideas that gave the push for expansion a moral vocabulary distinct from simple conquest.

In 1893, the historian Frederick Jackson Turner delivered his influential essay on the significance of the closing frontier, arguing that the availability of open western land had shaped American character and democracy for three centuries and that its disappearance, formally noted by the Census Bureau in 1890, marked the end of an era. Around the same time, Captain Alfred Thayer Mahan’s 1890 book on the influence of sea power argued that national greatness required a powerful navy, coaling stations, and overseas bases, an argument that directly influenced expansion-minded officials including Theodore Roosevelt and Henry Cabot Lodge. The severe economic depression that began in 1893 pushed American industrial and agricultural producers to look more seriously at foreign markets as an outlet for surplus goods, a concern that shows up repeatedly in the era’s business and political correspondence about Cuba, China, and Pacific trade routes.

The ideological layer: civilization, race, and religious mission

Economic and strategic motives were reinforced, and often justified publicly, by a set of ideas about racial hierarchy and civilizational duty common among American and European elites of the period. Popular writers and clergy, Josiah Strong among the most widely read, argued that Anglo-Saxon Protestant civilization carried a duty to uplift what they characterized as less-developed peoples, an argument that drew directly on the era’s Social Darwinist thinking and that supplied expansionists with a vocabulary of benevolence to describe policies that also served commercial and strategic interests. That combination, a genuine, sincerely held sense of civilizing mission sitting alongside hard commercial and naval calculation, recurs throughout the episodes covered in this guide and is one reason the “imperialism versus liberation” framing captures something real about how contemporaries themselves experienced the period’s contradictions.

The press and the push toward war with Spain

Sensationalized newspaper coverage of Spain’s brutal suppression of a Cuban independence uprising, coverage historians often describe as “yellow journalism” and associated with publishers including Joseph Pulitzer and William Randolph Hearst, built American public sympathy for Cuban rebels well before the U.S. government took direct action. The 1898 explosion that sank the battleship USS Maine in Havana harbor, killing more than 260 American sailors and never conclusively attributed to Spanish sabotage, became the immediate catalyst that turned public sympathy into a congressional declaration of war.

03 · Cuba

Cuba: the Teller Amendment and the Platt Amendment

Cuba is the case most often cited by those who describe the period as one of liberation, and it is also the case that most clearly shows why that description alone is incomplete. Congress declared war on Spain in April 1898 accompanied by the Teller Amendment, which explicitly renounced any U.S. intention to exercise sovereignty over Cuba and pledged to leave control of the island to its people once peace was restored, a commitment historians treat as genuine and distinct from how the United States behaved toward the Philippines in the same war.

The United States did keep that specific promise in the narrow sense that it did not formally annex Cuba. But it occupied the island militarily until 1902, and it made the end of that occupation conditional on Cuba’s constitutional convention accepting the 1901 Platt Amendment, which gave the United States the right to intervene in Cuban affairs to preserve independence and adequate government, barred Cuba from entering treaties that might impair its independence, and secured a permanent U.S. naval lease at Guantanamo Bay that continues today. Cuban delegates accepted the amendment only after being told U.S. troops would not otherwise leave, a form of consent under direct pressure that historians on both sides of the broader debate generally treat as coerced rather than freely negotiated.

What the U.S. occupation also built

The occupation years were not solely coercive. U.S. Army physician Walter Reed’s team confirmed the mosquito transmission of yellow fever in Cuba in 1900, and the subsequent public health campaign sharply reduced yellow fever and malaria mortality on the island, a genuine public health achievement frequently cited by those emphasizing the liberating and modernizing dimension of the U.S. presence. Infrastructure, school system reforms, and a new Cuban constitution modeled substantially on the U.S. Constitution were also products of the occupation period.

Why the case resists a single label

Cuba nominally became an independent republic in 1902, which is a meaningfully different outcome than the outright annexation the United States pursued in the Philippines, Puerto Rico, and Hawaii. But that independence operated for three decades under the explicit, treaty-based threat of renewed U.S. military intervention, a status closer to what historians of empire term a protectorate than to full sovereignty, and U.S. troops did in fact return to Cuba under Platt Amendment authority in 1906, 1912, and 1917. The Cuban case is frequently cited as the clearest example of the period’s core tension: a stated, and partly honored, anti-annexationist principle, combined with practical constraints on sovereignty that fall well short of full liberation.

04 · Philippines

The Philippines and the Philippine-American War

The Philippines is the episode historians most consistently point to as the strongest evidence for the imperialist description of this period, because it involves an explicit war fought by American forces against a people who had already declared their own independence and expected the United States to support that independence rather than replace Spain as their colonial ruler.

Filipino revolutionary leader Emilio Aguinaldo had been fighting Spanish colonial rule before the Spanish-American War began, and Filipino forces cooperated with the U.S. Navy against Spain on the understanding, encouraged by informal contact with American officers, that the United States supported Philippine independence. Instead, the December 1898 Treaty of Paris transferred the Philippines from Spain to the United States for a payment of $20 million, without consulting the Filipino government Aguinaldo had already declared. Fighting broke out between American and Filipino forces in February 1899 and escalated into a full war that continued into 1902, with lower-intensity resistance persisting for several years beyond that in some regions.

“Benevolent assimilation” and the conduct of the war

President McKinley described U.S. policy toward the Philippines as one of “benevolent assimilation,” a phrase that framed American rule as a temporary tutelary stage preparing Filipinos for eventual self-government. In practice, the war involved documented U.S. military use of the “water cure,” a torture technique used to extract information from prisoners, the establishment of civilian concentration zones in some provinces to separate the population from guerrilla fighters, and instructions from at least one American commander, Jacob Smith, ordering brutal reprisals following a Filipino ambush, an order that led to Smith’s own court-martial. Estimates of Filipino deaths during the war, from combat, disease, and famine conditions associated with the fighting, range widely across scholarly sources but are generally understood to run into the hundreds of thousands, alongside several thousand American combat deaths.

The slower path toward self-government

The 1902 Philippine Organic Act and later the 1916 Jones Act gradually extended limited Filipino self-governance and, in the Jones Act’s preamble, committed the United States to eventual independence once a “stable government” could be established, though without setting a firm date. That commitment was not fulfilled until the 1934 Tydings-McDuffie Act set a ten-year transition timeline, and full independence arrived only in 1946, a trajectory those emphasizing the liberating framing point to as evidence of eventual good faith, and one that those emphasizing the imperialist framing point to as nearly half a century between conquest and the promise’s fulfillment.

05 · Puerto Rico

Puerto Rico and the Insular Cases

Puerto Rico, also transferred from Spain to the United States under the 1898 Treaty of Paris, followed a different legal path than Cuba or the Philippines, one that produced a body of Supreme Court doctrine still cited in Puerto Rico’s legal status today.

The 1900 Foraker Act established a civilian government for Puerto Rico but stopped well short of statehood or full self-governance, providing for a U.S.-appointed governor and an upper legislative chamber while allowing only a lower chamber to be locally elected. Puerto Ricans held no vote in choosing the American officials with authority over the island, and no path toward statehood or independence was specified.

The Insular Cases and “unincorporated territory”

Beginning with Downes v. Bidwell in 1901, the Supreme Court ruled in a series of decisions known as the Insular Cases that the Constitution did not automatically or fully extend to newly acquired territories such as Puerto Rico, creating a legal category the Court called “unincorporated territory,” distinct from earlier U.S. territories that had been understood as on a path to eventual statehood. The reasoning in several of the opinions relied explicitly on characterizations of Puerto Rico’s population as belonging to what the Court’s majority described as an alien race unsuited to Anglo-Saxon constitutional principles, language modern legal scholars and several sitting Supreme Court justices have since criticized as resting on racial reasoning that would not be defensible under later constitutional doctrine.

Citizenship without full political rights

The 1917 Jones-Shafroth Act extended U.S. citizenship to Puerto Ricans, a change adopted just weeks before the United States entered the First World War and one that made Puerto Rican men subject to the military draft. Even with citizenship granted, Puerto Rico gained no voting representation in Congress and no vote for president, a structure that has persisted with modifications into the present day and that remains the direct legal descendant of the Insular Cases framework established at the start of this period.

06 · Hawaii

Hawaii: overthrow, then annexation

Hawaii’s path into the United States began five years before the Spanish-American War and involves one of the clearest documented instances of direct American complicity in the overthrow of a sovereign, internationally recognized government, followed by an annexation that a sitting U.S. president had previously refused to pursue on exactly those grounds.

In January 1893, a group of American and European sugar-planter and business interests in Hawaii, organized as a “Committee of Safety,” staged a coup against Queen Liliuokalani. U.S. Minister John L. Stevens ordered Marines from the USS Boston ashore during the coup, a deployment that lent the plotters implicit American military backing even without direct combat participation. President Grover Cleveland, who took office shortly after, ordered a formal investigation; the resulting Blount Report concluded the overthrow had been improperly aided by U.S. diplomatic and naval representatives and that the queen had been unlawfully deposed. Cleveland declined to pursue annexation on those grounds and unsuccessfully urged the restoration of the monarchy.

Annexation under a different administration and different circumstances

The provisional, and then self-declared “Republic of Hawaii” government continued lobbying for annexation through the 1890s. Under President McKinley, and amid the surge of expansionist sentiment accompanying the Spanish-American War, Hawaii was annexed in July 1898 through the Newlands Resolution, a joint resolution of Congress requiring only a simple majority in both chambers rather than the two-thirds Senate vote a formal annexation treaty would have required, a procedural path chosen in part because a treaty had earlier failed to secure sufficient Senate support. No plebiscite of the Hawaiian population was held, and a formal petition against annexation gathered signatures from a substantial majority of native Hawaiians eligible to sign it, a document historians now generally cite as clear evidence that annexation proceeded over the documented objection of most of the indigenous population.

A case with unusually little ambiguity

Among the episodes covered in this guide, Hawaii is the one where historians across the ideological spectrum find the least room for a liberation framing. A recognized, functioning constitutional monarchy was overthrown with American military assistance, a sitting U.S. president’s own investigation confirmed that assistance and called the overthrow unlawful, and annexation proceeded five years later regardless, over documented indigenous objection, through a procedural mechanism chosen specifically to avoid the higher vote threshold a treaty would have required.

07 · Panama

Panama, the Canal, and the Roosevelt Corollary

The acquisition of rights to build the Panama Canal involved the United States engineering, or at minimum decisively enabling, the secession of Panama from Colombia, followed by a broader declared policy asserting a U.S. right to intervene throughout the Western Hemisphere.

When Colombia’s senate rejected a 1903 treaty granting the United States rights to build a canal across its Panama province, the Roosevelt administration shifted its support to a Panamanian independence movement that had been organizing separately, partly in coordination with a French canal company engineer with a direct financial stake in the project’s completion. A U.S. Navy warship was positioned off Panama during the November 1903 uprising, and existing U.S. treaty rights dating to an 1846 agreement with Colombia were invoked to block Colombian troops from suppressing the rebellion. Panama declared independence within days, and the United States recognized the new government almost immediately, followed by the Hay-Bunau-Varilla Treaty granting the U.S. control over the Canal Zone, a treaty negotiated on Panama’s behalf by a French citizen rather than a Panamanian official.

The Roosevelt Corollary, 1904

The following year, Roosevelt formally announced what became known as the Roosevelt Corollary to the Monroe Doctrine, asserting that the United States would act as an “international police power” in the Western Hemisphere, intervening in the internal affairs of nations whose financial instability or “chronic wrongdoing” might otherwise invite European intervention. The corollary was applied almost immediately: the United States assumed control of the Dominican Republic’s customs revenue collection in 1905 to manage the country’s debts to European creditors, the first of a pattern of financial and military interventions across the Caribbean and Central America that continued for decades under Roosevelt’s successors.

Why this episode anchors the “Big Stick” characterization

Roosevelt himself summarized his approach with the phrase “speak softly and carry a big stick,” and the Panama episode is the one most often cited as its clearest illustration: a canal treaty the U.S. wanted, a sovereign national legislature that declined to grant it, and a subsequent secession the United States actively facilitated and immediately benefited from, all justified publicly in terms of commercial necessity and regional stability rather than territorial conquest.

08 · China

The Open Door Policy and China

American engagement with China in this period took a different shape than the Caribbean and Pacific episodes: rather than seeking territorial annexation, the United States pursued equal commercial access within a China that other powers were actively carving into exclusive spheres of influence, a policy that supporters describe as principled and critics describe as self-interested cover for a weaker competitive position.

Secretary of State John Hay issued a series of diplomatic notes in 1899 and 1900 calling on other foreign powers active in China, including Britain, Russia, Germany, France, and Japan, to preserve equal trading rights for all nations within their respective spheres of influence in China, rather than formally partitioning the country into exclusive colonial possessions as had happened across much of Africa. The Open Door Policy did not challenge the existing spheres of influence themselves, only their commercial exclusivity, a distinction historians note as evidence that the policy protected American trading access without requiring the United States to acquire Chinese territory of its own.

The Boxer Rebellion and its aftermath

In 1900, American troops joined a multinational military force, alongside Britain, Japan, Russia, Germany, France, and others, to suppress the Boxer Rebellion, an uprising targeting foreign nationals and Chinese Christians in response to foreign economic and religious encroachment. The subsequent 1901 Boxer Protocol imposed a large indemnity payment on China, and the United States later returned a substantial portion of its share of that indemnity to fund Chinese students’ education in the United States, an arrangement historians cite as a genuine, if partial, exception to the pattern of purely extractive indemnity collection practiced by most of the other participating powers.

Reading the China episode fairly

The China case is frequently cited by those emphasizing the liberating or at least non-annexationist framing of U.S. policy in this period, since the United States neither sought nor acquired Chinese territory. Critics of that framing note that the Open Door Policy served American commercial self-interest directly, since the United States, without existing colonial holdings in China, stood to benefit more than any other power from a rule requiring open access rather than exclusive spheres, and that American troops nonetheless participated directly in suppressing a Chinese anti-foreign uprising and in extracting indemnity payments from a weakened Chinese government.

09 · Dollar diplomacy

Dollar diplomacy under Taft

Under President William Howard Taft, U.S. foreign policy in Latin America and parts of East Asia increasingly relied on encouraging American banks and investors to extend loans to foreign governments, on the theory that dollars, and the influence that came with them, could substitute for direct military intervention, a strategy Taft’s Secretary of State Philander Knox described as “substituting dollars for bullets.”

In practice, dollar diplomacy did not fully substitute for military force. When a loan-based arrangement in Nicaragua provoked domestic unrest against a government the United States had helped install and finance, the Taft administration sent Marines in 1912, beginning an occupation that, with interruptions, lasted more than two decades. The pattern, American financial involvement creating leverage over a weaker government, followed by military intervention when that leverage produced instability rather than stability, recurred across several Central American and Caribbean states during and after this period.

Why this case is central to the “informal empire” debate

Dollar diplomacy involved no formal annexation and, in most cases, no permanent occupation comparable to the Philippines or Puerto Rico, which is why some historians resist applying the term imperialism to it directly. Other historians, working from the concept of informal empire, argue that a government whose customs revenue is collected by American officials, whose loans are extended on terms set by American banks, and whose stability is backed by the implicit or explicit threat of U.S. military intervention exercises meaningfully less independent sovereignty than the formal diplomatic language of the period suggested, regardless of whether a flag was ever raised over the territory in question.

10 · Wilson

Wilson: self-determination and intervention

Woodrow Wilson’s presidency produced the sharpest version of this period’s central tension, a president who articulated the principle of national self-determination on the world stage more forcefully than any predecessor, while simultaneously ordering more U.S. military interventions in Latin America and the Caribbean than any of his predecessors.

Wilson’s January 1918 Fourteen Points address to Congress, delivered as a framework for ending the First World War, called for “a free, open-minded, and absolutely impartial adjustment of all colonial claims” with attention to the interests of colonized populations, language that became closely associated with the broader principle of self-determination Wilson championed at the 1919 Paris Peace Conference and in his advocacy for the League of Nations.

Interventions that ran alongside the rhetoric

During the same presidency, U.S. forces occupied Veracruz, Mexico in 1914 over a diplomatic dispute connected to the Mexican Revolution, and General John J. Pershing led a extended, ultimately unsuccessful 1916 military expedition into Mexican territory pursuing revolutionary leader Pancho Villa following a cross-border raid. Wilson ordered the occupation of Haiti beginning in 1915, following the assassination of Haiti’s president, an occupation that lasted until 1934 and involved U.S. control over Haitian customs revenue and finances alongside direct military administration. A similar occupation of the Dominican Republic began in 1916 and lasted until 1924. In each case, the stated justification centered on restoring order and financial stability rather than territorial acquisition, language that closely echoes the Roosevelt Corollary framework Wilson’s own party had criticized when Roosevelt first articulated it.

Whose self-determination, in practice

At the Paris Peace Conference, Wilson’s self-determination principle was applied unevenly, extended to several European nationalities emerging from the collapsed Austro-Hungarian, Ottoman, and Russian empires, while colonial territories held by the victorious Allied powers, and requests presented by delegations including a Vietnamese petition and a Korean independence delegation, received little practical support from the American delegation. Historians treat this gap between Wilson’s stated universal principle and its uneven application, including within the hemisphere the United States itself directly controlled through occupation, as one of the clearest illustrations of the period’s core contradiction between expressed ideals and exercised power.

11 · The case for imperialism

The case for describing the period as imperialistic

Drawing the episodes above together, those who argue the “imperialistic power” description fits the period best point to a consistent structural pattern across nearly every case: territory or effective control acquired without the consent of the people affected, followed by governance structures that withheld the same political rights extended to American citizens elsewhere.

The Philippines were annexed following a war against a people who had already declared independence, and were governed for decades without full self-rule. Puerto Rico’s population gained citizenship but never full congressional representation, a status the Supreme Court’s Insular Cases explicitly grounded in racial reasoning about the population’s fitness for constitutional inclusion. Hawaii’s monarchy was overthrown with American military assistance and annexed over documented majority indigenous objection. Cuba’s formal independence operated under a treaty provision permitting repeated U.S. military re-intervention. Panama’s independence was engineered specifically to secure a canal treaty a prior sovereign legislature had declined to grant. The Roosevelt Corollary and dollar diplomacy extended a pattern of financial and military control across the Caribbean and Central America without formal annexation, but with customs receiverships, occupations, and long-term military administration in Haiti, the Dominican Republic, and Nicaragua.

Contemporary American critics made this case at the time

This was not solely a later historical reassessment. The Anti-Imperialist League, founded in 1898, drew support from figures as varied as Mark Twain, steel magnate Andrew Carnegie, labor leader Samuel Gompers, and 1900 Democratic presidential candidate William Jennings Bryan, who argued that annexing the Philippines without Filipino consent violated the country’s own founding principles of government by consent of the governed. Their objections were overwhelmingly defeated in the Senate ratification vote on the Treaty of Paris and in the 1900 election, but they establish that the imperialist critique is not an anachronistic modern judgment imposed retroactively; it was argued forcefully, by prominent Americans, in real time.

12 · The case for liberation

The case for describing the period as liberating

Those who argue the “liberating nation” description captures something real about the period point to a genuinely different set of facts: an anti-annexationist commitment that was, at least partially, honored in Cuba’s case; a policy in China that explicitly rejected territorial partition in favor of open commercial access; and a trajectory, however slow, toward self-government in nearly every territory the United States did acquire.

The Teller Amendment was a real, binding congressional commitment, adopted before the outcome of the war was known, and the United States did not annex Cuba despite having the clear military capacity to do so. The public health campaign that curbed yellow fever in Cuba, and similar sanitation and infrastructure investment in the Philippines and Puerto Rico, produced measurable improvements in health outcomes that benefited local populations directly rather than serving primarily as an instrument of American commercial extraction. The Open Door Policy in China explicitly rejected the colonial partition model other major powers were actively pursuing at the time. Every territory the United States acquired in this period eventually received either full independence, in Cuba’s case in 1902 and the Philippines’ case in 1946, or a path toward expanded citizenship and self-governance, as in Puerto Rico and Hawaii, rather than being permanently administered as a colony indefinitely, a trajectory that differs meaningfully from the classical European colonial empires of the same era.

Wilsonian idealism as a genuine, if incomplete, break

Wilson’s articulation of self-determination as a formal principle of international relations, whatever the gap between that principle and his own hemisphere policy, represented a rhetorical and diplomatic commitment with no clear precedent among the era’s other major powers, and it shaped the language subsequent generations used to argue against colonialism, including movements within territories the United States itself controlled. Advocates of the liberation framing argue that judging the entire period solely by its lowest moments, rather than by the stated principles that many of its participants took seriously and that shaped the period’s eventual outcomes, understates a real and distinctive strand within American foreign policy of this era.

13 · Consensus

Where do historians broadly agree?

Despite real disagreement over how to characterize the period as a whole, professional historians across the political and methodological spectrum agree on a substantial set of underlying facts, separate from the interpretive weight assigned to them.

There is broad agreement that the United States acquired formal or effective control over populated overseas territory, Hawaii, Puerto Rico, and the Philippines, without the consent of the people living there, and that in the Philippine case this involved a sustained war against a people who had already declared independence. There is broad agreement that the domestic debate over annexation, particularly regarding the Philippines, was genuine and closely contested in its own time, not a later invention, and that prominent contemporaries argued vigorously on both sides using constitutional, moral, racial, and strategic arguments. There is broad agreement that the legal framework applied to the newly acquired territories, especially the Insular Cases, relied explicitly on racialized reasoning about the populations involved, reasoning modern courts and legal scholars have widely repudiated even where the practical doctrine established has not been fully overturned. There is also broad agreement that economic motives, access to overseas markets, coaling stations, and investment opportunities, and strategic motives, naval basing and hemispheric security, both played real, documented roles in shaping expansion, alongside the ideological and religious justifications contemporaries offered publicly.

Whether a given episode from 1890 to 1920 reads as liberation or as conquest depends less on which speech a president gave about it than on three concrete facts: whether the affected population consented, what legal and political rights they held afterward, and how long full self-governance actually took to arrive. Pattern reflected across the diplomatic and legal record of the period

14 · Contested ground

Where does genuine debate continue?

Several questions about how to weigh and characterize this period remain genuinely unsettled among credentialed historians, not merely between political factions, and an honest treatment of the topic names them directly.

What was the primary driver of expansion: economics, strategy, or ideology?

Historians associated with the “Open Door” or economic-determinist school, building on work by Charles Beard and later William Appleman Williams, argue that the search for foreign markets and investment outlets was the primary engine of expansion, with strategic and ideological justifications functioning largely as public cover for commercial interests. Historians working from a realist or strategic tradition emphasize naval security, coaling stations, and great-power competition as the primary drivers, treating economic interests as one input among several rather than the determining one. A third, more culturally oriented school emphasizes that the racial and religious ideology of the period was not merely rhetorical packaging but a genuinely held worldview that shaped which policies elites considered legitimate in the first place. Most working historians today draw on more than one of these frameworks rather than treating them as mutually exclusive, but disagreement over relative weight remains active in the scholarship.

Does “informal empire” count as imperialism?

A second live debate concerns whether financial and diplomatic leverage exercised without formal annexation, dollar diplomacy, customs receiverships, and the Roosevelt Corollary’s interventions, should be classified using the same term as the direct annexation of the Philippines or Puerto Rico. Scholars who favor the informal empire framework argue that the practical loss of sovereignty experienced by a country under U.S.-controlled customs administration was not meaningfully different from colonial rule in its effects, even without a change in formal legal status. Scholars more cautious about extending the term argue that collapsing formal annexation and financial leverage into a single undifferentiated category of “imperialism” obscures real differences in duration, legal status, and the populations’ own political rights, and risks applying the label so broadly that it loses analytical precision.

How should Wilson’s contradiction be read?

A third area of disagreement concerns whether the gap between Wilson’s self-determination rhetoric and his hemisphere interventions reflects straightforward hypocrisy, a limited and racially bounded conception of which peoples the principle was ever meant to cover, or a genuinely evolving philosophy that had not yet been extended consistently by the end of his presidency. Historians who emphasize Wilson’s Southern upbringing and well-documented racial views argue the limitation was built into the principle from the start rather than an inconsistency in applying it. Others argue Wilson’s foreign policy thinking changed measurably over his two terms and that the war’s end came before that evolution could be tested against hemisphere policy in the way it was tested at Paris.

15 · Timeline

Timeline at a glance, 1890–1920

Because this period compresses so many distinct episodes into three decades, a single reference view of when each major event occurred is useful for keeping the sequence and overlap straight.

• 1893

  American-backed overthrow of Hawaii’s Queen Liliuokalani; Cleveland’s Blount Report later calls the coup unlawful.

• 1898

  Spanish-American War; Teller Amendment; sinking of USS Maine; Treaty of Paris transfers Philippines, Puerto Rico, and Guam; Hawaii annexed via joint resolution.

• 1899–1902

  Philippine-American War fought against Aguinaldo’s declared republic; Open Door Notes issued for China.

• 1900

  Foraker Act establishes civilian government in Puerto Rico; Boxer Rebellion suppressed by multinational force including U.S. troops.

• 1901

  Insular Cases begin with Downes v. Bidwell; Platt Amendment restricts Cuban sovereignty as a condition of U.S. withdrawal.

• 1902

  U.S. military occupation of Cuba ends; nominal Cuban independence begins under Platt Amendment constraints.

• 1903–1904

  Panama’s U.S.-facilitated secession from Colombia; Hay-Bunau-Varilla Treaty; Roosevelt Corollary announced.

• 1905

  U.S. assumes control of Dominican Republic customs collection under the Roosevelt Corollary.

• 1912

  U.S. Marines occupy Nicaragua following dollar-diplomacy-linked instability.

• 1914

  U.S. occupation of Veracruz, Mexico amid the Mexican Revolution.

• 1915–1916

  U.S. occupation of Haiti begins (1915); Pershing’s punitive expedition into Mexico; occupation of the Dominican Republic begins (1916); Jones Act commits to eventual Philippine independence.

• 1917

  Jones-Shafroth Act grants U.S. citizenship to Puerto Ricans without full political representation.

• 1918–1919

  Wilson’s Fourteen Points and self-determination principle; Paris Peace Conference applies the principle unevenly.

• 1920

  U.S. Senate rejects the Treaty of Versailles and League of Nations membership, closing the period without formal American adoption of Wilson’s proposed international framework.

16 · Common errors

Common misconceptions, addressed directly

Because this period is often taught in compressed form, a handful of specific misunderstandings recur. Naming them directly clears up a meaningful share of the confusion.

“The Teller Amendment proves the U.S. never sought territorial control over Cuba”

The United States kept the narrow letter of that promise by not formally annexing Cuba, but the Platt Amendment, required as a condition of ending U.S. occupation, restricted Cuban sovereignty for decades and secured a permanent U.S. military base. The two provisions need to be read together, not the Teller Amendment alone, to understand the actual outcome.

“The Philippines were annexed with the general consent of the Filipino population”

The opposite is closer to the documented record. Filipino revolutionaries had already declared independence and expected U.S. support for it; annexation instead led to a war against that declared government that continued for roughly three years and cost a large number of Filipino and American lives.

“Wilson consistently applied the principle of self-determination”

Wilson’s Fourteen Points rhetoric was applied unevenly at the Paris Peace Conference, extended more readily to European nationalities than to colonized populations elsewhere, and it coexisted with an active pattern of U.S. military occupation in Haiti, the Dominican Republic, and Mexico during his own presidency.

“Dollar diplomacy wasn’t really imperialism because no flag was raised”

Whether informal financial and political control constitutes imperialism is a genuinely contested question among historians, discussed above, rather than a settled negative. Formal annexation and informal financial leverage are different in legal form, but historians disagree, reasonably, about how different they were in practical effect on the sovereignty of the countries involved.

“This was purely a story of conquest, with no genuine liberating intent anywhere in it”

The Teller Amendment, the eventual grants of independence and expanded citizenship, and Wilson’s international advocacy for self-determination were real commitments made by real historical actors, not later inventions, even where they were applied incompletely or inconsistently. Treating the period as containing no liberating dimension at all is as much an oversimplification as treating it as containing no imperial dimension.

17 · Where this is heading

Where the historiography goes from here

Scholarly treatment of this period has continued to shift, particularly through the growth of Filipino-American, Puerto Rican, and Native Hawaiian historical scholarship that centers the experience and political agency of the populations affected by these policies rather than treating them primarily as objects of U.S. policy decisions made in Washington.

The Insular Cases remain live legal doctrine, not just history

Because the Insular Cases continue to govern Puerto Rico’s constitutional status, ongoing litigation and scholarly criticism of the doctrine’s racial reasoning connects this period directly to present-day legal and political debates over Puerto Rican statehood, independence, or continued territorial status, an unusually direct throughline from a 1901 court doctrine to an active twenty-first-century policy question.

Comparative empire studies

A growing body of scholarship situates U.S. expansion in this period within a broader comparative framework alongside British, French, Spanish, and Japanese imperial practices of the same era, asking how American expansion resembled and differed from those models rather than treating the U.S. case in isolation. This comparative turn has generally reinforced the case for treating the period as involving genuine imperial practices, while also highlighting specific features, the stated anti-annexationist commitments, the eventual grants of independence, that distinguished the American pattern from longer-lasting European colonial administrations elsewhere.

Renewed attention to Hawaiian sovereignty

Native Hawaiian sovereignty movements and a 1993 congressional joint resolution formally apologizing for the U.S. role in the 1893 overthrow have kept the Hawaii case, and the broader question of consent, central to ongoing historical and political discussion of this period, ensuring the debate covered in this guide remains an active one rather than a closed historical question.

Closing

Key takeaways

The United States between 1890 and 1920 does not sort cleanly into either the “imperialistic power” or “liberating nation” category, and the strongest answer to the question this guide opened with is that both descriptions are true of different episodes, and sometimes true of the same episode at the same time. Hawaii’s annexation followed an American-assisted overthrow that a sitting U.S. president’s own investigation called unlawful, with almost no ambiguity in the record. The Philippines were acquired through purchase from a departing colonial power and then held through a war against a people who had already declared independence, followed by a slow, eventually honored path to full independence in 1946. Cuba received nominal independence under an explicit congressional promise, constrained for decades by a treaty provision that undercut the practical value of that promise. Puerto Rico gained citizenship but not full political representation, under a legal doctrine resting on reasoning modern courts have disavowed even as its practical effects continue. China never became U.S. territory at all, and the Open Door Policy explicitly rejected the colonial partition other powers pursued, even as it served clear American commercial self-interest. Wilson articulated the era’s most idealistic language of self-determination while presiding over some of its most extensive military interventions. Reading this period well means holding all of these facts together rather than resolving the tension in either direction for the sake of a cleaner story.

18 · Notes

Frequently asked questions