Imperialism and Progressivism in the United States (c. 1890–1920)

American Imperialism

What “imperialism” means in the U.S. context

Imperialism is a policy in which a nation extends its power beyond its borders—through territorial acquisition, military occupation, political control, or economic dominance. In the United States in the late 1800s and early 1900s, imperialism took multiple forms:

  • Territorial empire: annexing land (for example, Hawai‘i in 1898).
  • Colonial control: governing people without granting full political equality (for example, the Philippines after 1898).
  • Informal empire: exerting economic and political influence without formal annexation (for example, U.S. influence in parts of Latin America and China).

It matters because it marks a major shift: the U.S. moved from a nation primarily focused on continental expansion to one acting as a global power with overseas interests. That shift shaped diplomacy, military policy, debates about race and citizenship, and arguments over what American democracy was supposed to mean.

A common misconception is that U.S. imperialism was only about “taking land.” On the AP exam, you need to be ready to explain how trade, naval strategy, strategic geography, and ideology (ideas about America’s mission) could lead to control even without outright annexation.

Why the U.S. turned outward (the “why” behind expansion)

You can understand the imperial turn by connecting several pressures that came together in the 1890s:

  1. Economic motives: Many business and political leaders argued the U.S. needed new markets and investment opportunities. This idea became especially persuasive after economic disruptions like the Panic of 1893.
  2. Strategic and military motives: Naval power advocates argued that a modern nation needed a strong navy and overseas bases. Alfred Thayer Mahan, in The Influence of Sea Power upon History (1890), argued that national greatness depended on sea power—strong fleets, coaling stations, and control of key maritime routes.
  3. Ideological motives: Some Americans believed expansion spread “civilization” and Christianity. This overlapped with racial assumptions common in the era (for example, ideas often summarized as the “white man’s burden”).
  4. Closing of the frontier: The 1890 census report famously declared the frontier line no longer clearly existed. Some leaders treated overseas expansion as a new outlet for national energy (even though this was more psychological and political than a direct replacement for western settlement).

These motives often worked together. For example, a naval base could be justified as “defense,” while also enabling trade and projecting power.

The Spanish–American War and a new overseas empire

The Spanish–American War (1898) is the key turning point because it quickly produced new U.S. possessions and raised fundamental questions about American identity.

How the war started (mechanism, not just a date)

The conflict grew out of Cuba’s struggle for independence from Spain. In the U.S., yellow journalism (sensational reporting, especially by newspapers associated with William Randolph Hearst and Joseph Pulitzer) inflamed public opinion by highlighting Spanish abuses and portraying intervention as a moral duty.

A major spark was the explosion of the USS Maine in Havana Harbor (1898). Many Americans blamed Spain (although the exact cause was uncertain at the time), and the incident became a rallying cry.

The war was brief, and the U.S. defeated Spain in the Caribbean and the Pacific.

What the U.S. gained and why it mattered

The Treaty of Paris (1898) ended the war. Spain relinquished control of Cuba and ceded Puerto Rico and Guam to the United States; the U.S. also acquired the Philippines (for a payment to Spain).

This produced immediate consequences:

  • The U.S. now governed overseas territories with large nonwhite populations.
  • Americans debated whether these new lands would become states, colonies, or something else.
  • The war boosted nationalist confidence and encouraged future interventions.

A frequent AP-level confusion: Cuba was not annexed like Puerto Rico. The U.S. treated Cuba as formally independent but heavily controlled its options.

Cuba and the Platt Amendment

After the war, the U.S. military occupied Cuba for several years. The Platt Amendment (1901) (incorporated into the Cuban constitution) limited Cuban sovereignty by giving the U.S. the right to intervene to preserve order and required Cuba to lease land for U.S. naval stations (including Guantánamo Bay).

This is a classic example of informal empire: Cuba was independent on paper but constrained in practice.

The Philippines and the contradiction of “liberty”

U.S. acquisition of the Philippines triggered a major crisis: could a republic founded on consent govern people who never consented?

Philippine–American War

Filipino nationalists who had fought Spain sought independence, but the U.S. decided to keep the islands. The resulting Philippine–American War (1899–1902) was a brutal conflict involving guerrilla warfare and harsh U.S. counterinsurgency tactics.

This conflict matters on APUSH because it reveals a recurring pattern: U.S. leaders often framed expansion as “uplift” or “protection,” while critics pointed to violence, racism, and denial of self-determination.

The Anti-Imperialist League

The Anti-Imperialist League opposed annexation of the Philippines, arguing it violated American democratic principles. Notable members included figures such as Mark Twain and Andrew Carnegie. Their arguments were not always purely egalitarian—some opponents also feared incorporating nonwhite peoples or competing labor—so it’s important not to oversimplify them as uniformly “progressive.”

Hawai‘i, the Pacific, and strategic annexation

The U.S. annexed Hawai‘i in 1898. American planters and business interests had long been influential there, and the overthrow of Queen Liliuokalani in the 1890s helped set the stage for annexation.

Why it mattered:

  • Hawai‘i became a crucial naval and commercial stepping stone across the Pacific.
  • It illustrates how economic influence and settler interests could drive foreign policy.

The Open Door Policy in China

Unlike in the Caribbean and Pacific islands, the U.S. did not annex parts of China. Instead, Secretary of State John Hay promoted the Open Door Policy (1899–1900), calling for equal trading rights among foreign powers and support for China’s territorial integrity.

Mechanism: it attempted to prevent European powers and Japan from carving China into exclusive spheres that would shut out American trade.

The Boxer Rebellion (1900) (an anti-foreign uprising) led to an international military response that included U.S. troops, reinforcing the idea that the U.S. had global interests worth defending.

“Big Stick,” the canal, and interventions in Latin America

Presidents in the early 1900s used expanded executive power to shape foreign policy.

Theodore Roosevelt: Big Stick Diplomacy

Big Stick Diplomacy is associated with Theodore Roosevelt’s approach: negotiate but back diplomacy with the credible threat of force.

The Panama Canal is the best “in action” example. The U.S. supported Panama’s separation from Colombia and then gained rights to build and control the canal zone. The canal mattered because it:

  • dramatically reduced travel time for U.S. naval and commercial ships between the Atlantic and Pacific
  • increased U.S. strategic dominance in the Western Hemisphere
Roosevelt Corollary

The Roosevelt Corollary to the Monroe Doctrine asserted that the U.S. could intervene in Latin American nations to stabilize them and prevent European intervention, especially over debt.

This helps you understand a major continuity: U.S. leaders often framed interventions as protective or stabilizing, but they also expanded U.S. influence and limited the sovereignty of other nations.

Taft: Dollar Diplomacy

Under William Howard Taft, Dollar Diplomacy emphasized using U.S. investment and economic influence to achieve foreign policy goals. The idea was that American banks and businesses could stabilize regions and advance U.S. interests—sometimes backed by force when economic leverage wasn’t enough.

Wilson: Moral Diplomacy

Woodrow Wilson promoted Moral Diplomacy, claiming the U.S. should support democracy and moral principles abroad. In practice, Wilson also intervened in Latin America (including actions involving Mexico) when he believed U.S. interests or stability were at stake—showing how idealistic language could coexist with coercive power.

A common mistake is to treat these diplomacies as totally different “types” with no overlap. On the exam, you’ll score higher if you show both contrast (style and justification) and continuity (the U.S. repeatedly intervened to protect strategic/economic interests).

Imperialism’s domestic consequences

Imperialism didn’t stay overseas—it affected politics and law at home.

  • Debates over citizenship and rights: The Insular Cases (early 1900s Supreme Court decisions) addressed whether constitutional rights automatically applied in U.S. territories. The Court’s reasoning allowed the U.S. to hold territories without fully incorporating them as future states, creating a flexible but unequal imperial structure.
  • Military and executive power: Overseas commitments strengthened the presidency and normalized a more active global role.
  • Race and national identity: Arguments about who could be part of the nation intensified; imperial rhetoric often relied on racial hierarchy.

Example: building a strong APUSH causal explanation

If you were asked to explain causes of U.S. overseas expansion in the 1890s, a strong causal chain might look like:

  1. Industrial growth increased production and intensified interest in overseas markets.
  2. Strategic thinkers (Mahan) and policymakers argued sea power required bases and coaling stations.
  3. Cuba crisis + yellow journalism + USS Maine created public and political momentum.
  4. Victory in 1898 made territorial acquisition possible and normalized a more interventionist posture.

Notice how this goes beyond listing causes—it shows how they reinforce each other.

Exam Focus
  • Typical question patterns:
    • Explain the causes and/or consequences of the Spanish–American War and connect them to later U.S. foreign policy.
    • Compare Roosevelt, Taft, and Wilson’s foreign policies using specific evidence (canal, corollary, dollar diplomacy, interventions).
    • Use documents (political cartoons, speeches) to evaluate pro- vs. anti-imperialist arguments.
  • Common mistakes:
    • Treating Cuba as a U.S. colony identical to the Philippines (instead, explain the Platt Amendment and informal control).
    • Describing “Open Door” as annexation (it was about trade access and influence, not taking territory).
    • Assuming anti-imperialism was purely humanitarian (some arguments were democratic; others were economic or racist).

The Progressive Era

What progressivism was (and what it wasn’t)

Progressivism was a broad reform movement (roughly the 1890s through the 1910s) aimed at addressing problems created or intensified by industrial capitalism, rapid urbanization, political corruption, and rising inequality. Progressives believed that government could—and should—play an active role in improving society.

It’s crucial to understand progressivism as a coalition, not a single ideology. Progressives disagreed on methods and goals:

  • Some emphasized efficiency and expert management (often middle-class professionals).
  • Some emphasized democracy and expanding popular participation.
  • Some emphasized social justice, though many progressive reforms excluded or marginalized African Americans and other groups.

A common misconception is that “Progressive Era” means “everyone became progressive.” In reality, the era included backlash, limits, and reformers who sometimes reinforced existing social hierarchies.

Why progressivism emerged

Progressivism grew from visible problems in late 19th-century life:

  • Urban problems: overcrowded housing, sanitation crises, polluted water, disease.
  • Workplace issues: dangerous factories, long hours, child labor, weak bargaining power.
  • Political corruption: city machines and patronage systems.
  • Corporate power: monopolies/trusts influencing markets and politics.

Progressives responded with the idea that modern society required modern solutions: regulation, data, professional expertise, and—often—new democratic tools to reduce corruption.

How progressivism worked: strategies reformers used

Progressives used multiple, reinforcing strategies.

1) Investigate and publicize: muckraking

Muckrakers were journalists and writers who exposed corruption, exploitation, and unsafe conditions. Their work mattered because it helped create public pressure for legislation.

Example in action:

  • Upton Sinclair’s The Jungle (1906) revealed horrifying conditions in the meatpacking industry. Although Sinclair hoped to highlight labor exploitation, many readers focused on food safety—showing how reform outcomes could differ from reformers’ intentions.

This public reaction contributed to federal consumer protection measures like the Meat Inspection Act (1906) and the Pure Food and Drug Act (1906).

2) Use government power: regulation and administration

Progressives often trusted the state to regulate business and protect the public interest. That could mean:

  • creating commissions
  • passing safety standards
  • enforcing antitrust laws

This is where progressivism intersects with a bigger historical trend: the federal government grew more active in economic and social life.

3) Reform democracy: change political structures

Some progressives argued that political corruption flourished because ordinary voters had too little influence or because party machines controlled nominations.

Reforms included:

  • Initiative: citizens propose laws via petition.
  • Referendum: citizens vote directly on proposed laws.
  • Recall: citizens vote to remove an elected official.
  • Direct primary: voters choose party nominees instead of party bosses.

At the federal level, the Seventeenth Amendment (1913) established direct election of U.S. senators, reducing the role of state legislatures (and the corruption progressives associated with them).

A common AP error is to list these reforms without explaining the mechanism: they were meant to weaken party machines and increase accountability by shifting power toward voters.

4) Professionalize and “rationalize” cities

Progressives pushed city reforms like:

  • city manager systems
  • commissions
  • professional police and sanitation departments

The goal was efficiency—but critics argued these reforms could reduce democratic control by shifting power to appointed experts.

The role of women and reform networks

Women were central to progressive reform, even before they could vote nationally. Many women entered public life through:

  • settlement houses
  • temperance and public health campaigns
  • education reform
  • consumer protection efforts

The best way to understand this is to see how “private” responsibilities (caregiving, household management) were reinterpreted as public concerns—clean food, safe water, child welfare. This logic helped women claim authority in reform politics.

Example: Jane Addams and Hull House in Chicago modeled the settlement house movement—community centers in immigrant neighborhoods that provided services (childcare, classes, cultural programs) and advocated reforms.

Progressive presidents: Roosevelt, Taft, Wilson

Presidential progressivism shows how reform ideas translated into federal power.

Theodore Roosevelt and the Square Deal

Theodore Roosevelt promoted the Square Deal, aiming to balance the interests of labor, consumers, and business.

Key pieces:

  • Trust-busting: Roosevelt used the Sherman Antitrust Act more aggressively than earlier presidents, distinguishing between “good” and “bad” trusts in his rhetoric.
  • Consumer protection: strengthened after muckraker exposés (1906 food and drug laws).
  • Conservation: Roosevelt expanded federal conservation efforts, including protection of forests and creation/expansion of national parks and monuments.

Important nuance: “trust-busting” did not mean ending big business. It meant regulating corporate power and asserting that government could intervene.

Taft and antitrust

William Howard Taft brought many antitrust cases as well, even though he is often remembered as less charismatic than Roosevelt. Political conflict between their supporters contributed to the split in the Republican Party.

Wilson and New Freedom

Woodrow Wilson’s New Freedom initially emphasized competition and limiting monopolies. Under his administration:

  • the Federal Reserve Act (1913) reorganized the banking system and created a central banking structure to manage the money supply and credit conditions
  • the Clayton Antitrust Act (1914) strengthened antitrust policy and limited the use of injunctions against labor unions
  • the Federal Trade Commission (1914) was created to investigate and prevent unfair business practices

These reforms show the progressive belief that a modern economy needed rules and institutions—not just laissez-faire.

Limits and contradictions of progressivism

A high-scoring APUSH understanding includes the movement’s blind spots:

  • Racial injustice: Many progressives did little to confront segregation and disfranchisement; some reforms excluded Black Americans. Wilson’s administration, for example, tolerated or promoted segregation in federal workplaces.
  • Nativism and cultural pressure: Some progressives supported “Americanization” programs that pressured immigrants to conform.
  • Prohibition and moral regulation: Some reforms increased state power over personal behavior, raising questions about liberty.

Progressivism expanded the idea that government should protect the public—but Americans disagreed about what “public good” meant and whose rights counted.

Example: writing a thesis that shows complexity

Prompt style: “Evaluate the extent to which progressivism improved democracy and society.”

A sophisticated thesis might argue:

  • Progressives expanded democratic participation through reforms like direct primaries and the Seventeenth Amendment, and improved public welfare through regulation.
  • However, many reforms were limited by racial exclusion and by efficiency-driven systems that sometimes reduced direct democratic control.

That structure demonstrates both change and limits—a frequent AP scoring expectation.

Exam Focus
  • Typical question patterns:
    • Explain how progressives responded to problems of industrialization and urbanization (often using specific reform examples).
    • Compare Roosevelt’s Square Deal and Wilson’s New Freedom (regulation vs. competition emphasis, specific acts).
    • Analyze how a reform (initiative/referendum/recall, direct election of senators) attempted to reduce corruption.
  • Common mistakes:
    • Treating progressivism as a single, unified program (instead, describe it as varied and sometimes contradictory).
    • Forgetting the limits: race, immigration/nativism, and coercive moral reform.
    • Listing laws without explaining what problem they targeted (always link reform to the underlying industrial/urban issue).

Progressive Reform Movements

How to think about “reform movements” within progressivism

Progressivism wasn’t only presidents and laws—it was also networks of activists and organizations pushing specific reforms. A helpful way to understand these movements is to ask three questions:

  1. What problem are they trying to solve? (unsafe food, corrupt politics, poverty, alcohol abuse)
  2. What tool do they use? (state law, constitutional amendments, local services, labor organizing)
  3. Who benefits—and who is left out?

That last question matters because many reforms improved life for millions while still reinforcing exclusions.

Labor reform and the struggle for workplace justice

Progressives and labor activists targeted dangerous working conditions, low wages, and child labor. Unlike some “efficiency” reforms, labor reform directly challenged how power worked in the workplace.

The Triangle Shirtwaist Factory fire

The Triangle Shirtwaist Factory fire (1911) in New York City killed many garment workers (mostly young immigrant women). It became a powerful symbol because it exposed:

  • locked doors and unsafe exits
  • weak regulation
  • the human cost of industrial speed and profit

In response, states (especially New York) strengthened workplace safety rules and building codes. This is a concrete example of the progressive pattern: tragedy or exposé generates public outrage, which helps reformers pass regulation.

Child labor and regulation

Reformers fought child labor, arguing children needed education and protection. Some federal attempts faced constitutional challenges, so reform often advanced at the state level during this era.

A common mistake is to assume one law “ended” child labor in the Progressive Era. On APUSH, it’s safer to explain it as a long struggle with partial, uneven reforms over time.

Temperance and Prohibition: moral reform with major consequences

The temperance movement aimed to reduce alcohol consumption, linking alcohol to domestic violence, poverty, and workplace accidents. Many supporters—especially women—saw temperance as protecting families.

Temperance activism helped lead to national Prohibition through the Eighteenth Amendment (ratified 1919), later enforced by the Volstead Act.

Why it mattered:

  • It shows progressivism could involve expanding state power over personal behavior.
  • It generated unintended consequences, including growth of illegal markets and organized crime (a theme you can mention as complexity, without needing to over-detail).

A frequent misconception is that Prohibition was only about “morality.” It also intersected with politics, immigration (anti-saloon sentiment sometimes targeted immigrant cultures), and women’s activism.

Women’s suffrage: expanding democracy

The women’s suffrage movement sought voting rights as a matter of political equality and practical reform (the vote would allow women to influence legislation on education, health, and labor).

The movement used multiple strategies:

  • state-by-state campaigns
  • national lobbying
  • public demonstrations

The Nineteenth Amendment (ratified 1920) prohibited denying the vote on the basis of sex.

Why it mattered:

  • It was one of the most significant democratic expansions of the era.
  • It shows how social movements, not just presidents, drive constitutional change.

Important nuance: suffrage gains did not mean all women could vote equally in practice. Many Black women in the South still faced disfranchisement due to poll taxes, literacy tests, intimidation, and other Jim Crow barriers that also targeted Black men.

Urban reform, public health, and the settlement house approach

Progressive urban reform tackled the everyday realities of city life.

Settlement houses

As introduced earlier, settlement houses combined direct service with advocacy. They offered:

  • English classes and job training
  • childcare and youth programs
  • cultural events
  • investigations into housing and labor conditions

They mattered because they represent a “both/and” reform strategy: help individuals now and change policy for long-term improvement.

Public health and city infrastructure

Progressives pushed:

  • sanitation systems
  • clean water initiatives
  • housing codes
  • food safety rules

Mechanism: these reforms often relied on expanding city and state administrative capacity—inspectors, health departments, and professional standards.

Political reforms: attacking corruption and increasing responsiveness

Progressive political reforms weren’t only “more democracy” in the abstract—they were attempts to break specific systems.

Breaking the power of party machines

City political machines provided services and jobs in exchange for votes, thriving in part because governments offered limited welfare supports. Progressives argued machines encouraged corruption and inefficiency.

Political reforms (direct primaries, initiative/referendum/recall) attempted to:

  • weaken backroom nominations
  • allow citizens to bypass legislatures
  • remove corrupt officials

A subtle point that can raise your APUSH analysis: machines sometimes met real needs in immigrant communities; reformers’ “clean government” could reduce patronage but also remove a support network without replacing it adequately.

Conservation vs. preservation: environmental reform debates

Progressive conservation was not just “saving nature”—it was also about how to manage resources in an industrial economy.

  • Conservation generally meant regulated, planned use of resources to prevent waste.
  • Preservation generally meant protecting nature from use (keeping areas wild).

The federal government expanded forest reserves and national parks/monuments in this era, especially under Theodore Roosevelt.

Why it matters: it shows progressivism’s faith in expert management and the growing role of federal power.

Civil rights and the limits of reform

Many Americans fought for racial justice in this period, including activists associated with organizations such as the NAACP (founded 1909). However, progressivism as a national political movement often failed to challenge segregation and disfranchisement forcefully.

This “limit” is a recurring AP theme: reform in one area can coexist with stagnation or regression in another.

Example: how to connect multiple reform movements in one argument

Suppose you are writing a Long Essay Question about how progressives expanded the role of government. You could build a connected argument like this:

  • Consumer protection laws (food/drug regulation) expanded federal responsibility for health and safety.
  • Labor and safety reforms (post-Triangle fire state laws) expanded state responsibility for workplace conditions.
  • Political reforms (Seventeenth Amendment, direct primaries) expanded the idea that government should be more responsive to voters.
  • Prohibition expanded state power in a different direction—regulating personal behavior—showing progressivism’s internal tensions.

The key is to show a pattern (government activism) while acknowledging contradictions (democratic expansion vs. coercive moral regulation; reform vs. exclusion).

Exam Focus
  • Typical question patterns:
    • Explain how specific reform movements (temperance, suffrage, labor, settlement houses) addressed industrial and urban problems.
    • Analyze continuities and changes in the role of government from the Gilded Age into the Progressive Era using evidence.
    • Evaluate the effectiveness and/or limits of a reform (often asking you to address both achievements and shortcomings).
  • Common mistakes:
    • Treating the Nineteenth Amendment as “full political equality” achieved (instead, note ongoing legal/social barriers, especially racial disfranchisement).
    • Writing about reforms as isolated events rather than linked responses to industrialization and urbanization.
    • Ignoring unintended consequences (especially with Prohibition) or overclaiming that one reform “solved” a problem nationwide.