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William McKinley: The 25th US President, The Spanish-American War, and the Birth of a Global Superpower

The Civil War Antietam veteran who won the historic 1896 election, led the nation in the Spanish-American War, acquired Hawaii, Puerto Rico, and the Philippines, and was assassinated in 1901.

✍️ Historical & Political Research Team 📅 August 28, 2026 ⏱️ Reading Time: 18 minutes

📌 Executive Profile & Vital Statistics

Full Name: William McKinley Jr.
Presidency: 25th President (March 4, 1897 – September 14, 1901)
Born: January 29, 1843 (Niles, Trumbull County, Ohio)
Died: September 14, 1901 (Aged 58, Buffalo, New York)
Military Distinction: Last US President to have served in the American Civil War (enlisted as a private in 23rd Ohio Infantry under Hayes, fought at Antietam)
Historic Transformation: Spanish-American War (1898); elevated the United States into an imperial global superpower
Territorial Acquisitions: Annexed Hawaii (1898); acquired Puerto Rico, Guam, and the Philippines from Spain
Economic Landmark: Signed the **Gold Standard Act of 1900**, ending the free silver controversy
Tragic Assassination: Shot by anarchist Leon Czolgosz at the Pan-American Exposition in Buffalo (September 6, 1901); died eight days later, elevating Theodore Roosevelt to the presidency
Spouse: Ida Saxton McKinley (m. 1871, d. 1907)

1. Civil War Private at Antietam to Ohio Governor & Tariff Champion

William McKinley Jr. was born on January 29, 1843, in Niles, Ohio. Enlisting as an eighteen-year-old private in the 23rd Ohio Infantry in 1861, McKinley served under Rutherford B. Hayes. At the bloodbath of the Battle of Antietam (September 17, 1862), Sergeant McKinley drove a horse-drawn supply wagon under heavy Confederate artillery and musket fire to serve hot coffee and rations to pinned-down Union troops, earning a battlefield commission to lieutenant from Governor David Tod. McKinley was the last US President to have fought in the Civil War.

Serving fourteen years in Congress, McKinley authored the protective McKinley Tariff of 1890 and served two terms as Governor of Ohio (1892–1896). In 1896, managed by industrialist Mark Hanna in his famous "Front Porch Campaign" from Canton, Ohio, McKinley defeated William Jennings Bryan in the most transformative realignment election of the Gilded Age.

3. The Spanish-American War (1898): "A Splendid Little War"

When the battleship USS Maine exploded in Havana Harbor on February 15, 1898, McKinley reluctantly asked Congress for war against Spain to liberate Cuba.

In a lightning 100-day conflict termed by Ambassador John Hay as "a splendid little war," Commodore George Dewey destroyed the Spanish fleet in Manila Bay, and American forces defeated Spain in Cuba and Puerto Rico. Under the Treaty of Paris (1898), Spain ceded Puerto Rico, Guam, and the Philippine archipelago to the United States for $20 million, and recognized Cuban independence. In July 1898, McKinley also signed the Newlands Resolution annexing the Republic of Hawaii.

6. The September 1901 Assassination in Buffalo & Ascension of TR

On September 6, 1901, President McKinley was greeting visitors in the Temple of Music at the Pan-American Exposition in Buffalo, New York. Deranged anarchist Leon Czolgosz approached the president with a .32-caliber Iver Johnson revolver concealed beneath a handkerchief, firing two bullets into McKinley's chest and abdomen.

As crowds tackled the assassin, McKinley whispered to his aides: "Be easy with him, boys," and instructed them to break the news gently to his invalid wife, Ida. Despite early signs of recovery, gangrene developed around the internal wound. McKinley died peacefully on September 14, 1901, whispering his favorite hymn, "Nearer, My God, to Thee." His death elevated 42-year-old Vice President Theodore Roosevelt to the presidency, inaugurating the Progressive Era.

Frequently Asked Questions (FAQ)

What major war occurred during William McKinley's presidency?

The Spanish-American War of 1898, which resulted in the US acquiring Puerto Rico, Guam, and the Philippines, and annexing Hawaii.

Who assassinated William McKinley?

Anarchist Leon Czolgosz shot McKinley on September 6, 1901, at the Pan-American Exposition in Buffalo, New York; McKinley died eight days later on September 14.

What was William McKinley's signature economic policy?

He signed the Gold Standard Act of 1900, formally placing the US monetary system entirely on gold, and championed high protective tariffs to protect domestic manufacturing.

Where can I learn more about all other US Presidents?

Explore our complete chronological guide to all 45 commanders-in-chief in our master directory: Complete List of All US Presidents (1st to 47th).