---
title: "William McKinley — APUSH Definition & Exam Guide"
description: "William McKinley was the president (1897-1901) who led the U.S. into the Spanish-American War and the age of imperialism. Key for APUSH Topic 7.3 and Unit 7."
canonical: "https://fiveable.me/apush/key-terms/william-mckinley"
type: "key-term"
subject: "AP US History"
unit: "Unit 7"
---

# William McKinley — APUSH Definition & Exam Guide

## Definition

William McKinley was the 25th U.S. president (1897-1901) whose administration won the Spanish-American War, annexed Hawaii and the Philippines, and launched the United States into overseas imperialism before his assassination in 1901 made Theodore Roosevelt president.

## What It Is

William McKinley was the Republican president from 1897 until his assassination in 1901, and he's the face of America's turn toward empire. He won the [election](/apush/key-terms/election "fv-autolink") of 1896 by defending the gold standard against William Jennings Bryan, but on the AP exam he matters most for what happened in 1898. After the Cuban revolt against Spain, the De Lome letter, and the explosion of the USS Maine, McKinley asked [Congress](/apush/unit-5/reconstruction/study-guide/DiWHCM2v4Drc73iIcfDS "fv-autolink") to declare war on Spain. The quick American victory in the Spanish-American War gave the U.S. island territories in the Caribbean and the Pacific (Puerto Rico, Guam, the Philippines), exactly the outcome KC-7.3.I.C describes.

McKinley's presidency also annexed Hawaii (1898) and pulled the U.S. deeper into [Asia](/apush/unit-6/rise-industrial-capitalism-1865-1898/study-guide/KgfyIEY4fiMV5yk7Ng0X "fv-autolink"), including the Open Door policy in China and the suppression of the Filipino nationalist movement led by Emilio Aguinaldo. In other words, under McKinley the U.S. stopped just dominating the Western Hemisphere and started acting like a global imperial power. When an anarchist assassinated him in September 1901, his vice president Theodore Roosevelt took over and ran with that new global role.

## Why It Matters

McKinley anchors **Topic 7.3 (The Spanish-American War)** and supports learning objective **[APUSH](/apush "fv-autolink") 7.3.A**, explaining the effects of that war. The essential knowledge is basically a summary of his presidency: the U.S. acquired island territories in the Caribbean and Pacific, got more involved in Asia, and suppressed a nationalist movement in the [Philippines](/apush/key-terms/philippines "fv-autolink"). He also connects back to **Topic 4.4 (America on the World Stage)** and **APUSH 4.4.A**, because the exam loves the long arc of foreign policy. The Monroe Doctrine era was about controlling the Western Hemisphere; McKinley's wins in 1898 are the moment that hemispheric ambition goes global. That makes him a go-to data point for continuity-and-change questions about American foreign policy under the America in the World (WOR) theme.

## Connections

### Spanish-American War (Unit 7)

This is McKinley's defining event. He's the president who asked for the war declaration in 1898 and then decided to keep the Philippines, which turned a 'splendid little war' into a long imperial commitment. If a question mentions McKinley, the war and its territorial spoils are almost always the point.

### [Annexation of Hawaii (Unit 7)](/apush/key-terms/annexation-of-hawaii)

Cleveland had refused to annex [Hawaii](/apush/key-terms/hawaii "fv-autolink") after American planters overthrew Queen Liliuokalani, but McKinley pushed annexation through in 1898. Hawaii shows his imperialism wasn't just a side effect of war with Spain; it was a deliberate Pacific strategy (Hawaii was a coaling station on the way to Asian markets).

### Imperialism (Unit 7)

McKinley is the test case in the imperialism debate. [Anti-imperialists](/apush/key-terms/anti-imperialists "fv-autolink") argued ruling the Philippines without consent betrayed American ideals, while McKinley's side talked about duty, markets, and naval power. DBQs on overseas expansion expect you to place his decisions inside that argument.

### [Big Stick Diplomacy (Unit 7)](/apush/key-terms/big-stick-diplomacy)

McKinley's assassination in 1901 put [Theodore Roosevelt](/apush/key-terms/theodore-roosevelt "fv-autolink") in the White House. Roosevelt's Big Stick approach built directly on the empire McKinley acquired, so McKinley is the setup and Roosevelt is the follow-through in the story of America becoming a world power.

## On the AP Exam

You usually won't get a question that just asks who McKinley was. Instead, multiple-choice stems hand you an excerpt from the 1890s (a pro-imperialist speech, an anti-imperialist pamphlet, a political cartoon about the Philippines) and ask what development it reflects or what caused it. McKinley is your context clue that the answer involves the Spanish-American War, overseas territories, or the imperialism debate. No released FRQ has centered on McKinley by name, but he's strong evidence in essays about why U.S. foreign policy expanded over time (APUSH 4.4.A) or the effects of the Spanish-American War (APUSH 7.3.A). The move that scores points is using him to mark change: before 1898, hemispheric influence; after 1898, an overseas empire stretching to the Pacific.

## William McKinley vs Theodore Roosevelt

Students constantly hand Roosevelt credit for 1898. McKinley was president during the Spanish-American War, the annexation of Hawaii, and the acquisition of the Philippines; Roosevelt was his rough-riding subordinate and then vice president. Roosevelt only becomes president after McKinley's assassination in 1901, and his Big Stick Diplomacy and Panama Canal come after that. Quick check: anything 1898 belongs to McKinley, anything 'Roosevelt Corollary' or canal-related belongs to TR.

## Key Takeaways

- William McKinley was president from 1897 to 1901, and his administration led the U.S. into the Spanish-American War in 1898.
- Victory over Spain under McKinley gave the U.S. island territories in the Caribbean and Pacific, including Puerto Rico, Guam, and the Philippines (KC-7.3.I.C).
- McKinley annexed Hawaii in 1898 and increased U.S. involvement in Asia, including suppressing the Filipino nationalist movement.
- He won the election of 1896 against William Jennings Bryan partly by defending the gold standard, which ended the Populist free-silver push.
- McKinley's assassination in 1901 made Theodore Roosevelt president, so McKinley built the overseas empire that Roosevelt's Big Stick Diplomacy expanded.
- On the exam, McKinley works as evidence for the shift from hemispheric influence (Monroe Doctrine era) to global imperialism after 1898.

## FAQs

### What did William McKinley do as president?

McKinley (1897-1901) led the U.S. into the Spanish-American War, annexed Hawaii, acquired Puerto Rico, Guam, and the Philippines from Spain, and expanded U.S. involvement in Asia. He was assassinated in 1901.

### Did McKinley want the Spanish-American War?

Not at first. McKinley initially resisted war with Spain, but pressure from yellow journalism, the De Lome letter, and the explosion of the USS Maine in February 1898 pushed him to ask Congress for a declaration of war in April 1898.

### How is McKinley different from Theodore Roosevelt?

McKinley was president during the Spanish-American War and the acquisitions of 1898; Roosevelt was his vice president who became president after McKinley's assassination in 1901. Roosevelt's Big Stick Diplomacy and the Panama Canal came later, building on McKinley's empire.

### Why is McKinley important for APUSH?

He marks the turning point when the U.S. became an imperial world power. The exam tests the effects of the Spanish-American War (APUSH 7.3.A), and McKinley's presidency delivers all of them: Caribbean and Pacific territories, Asian involvement, and the suppression of Filipino nationalists.

### Did McKinley annex the Philippines?

Yes. After defeating Spain in 1898, McKinley chose to keep the Philippines under the Treaty of Paris rather than grant independence, which triggered the Philippine-American War against Emilio Aguinaldo's nationalist movement and a fierce anti-imperialist debate at home.

## Related Study Guides

- [7.3 The Spanish-American War](/apush/unit-7/spanish-american-war/study-guide/oTnk4443gyjW9WwKdPbK)

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