William McKinley, the 25th President of the United States, was born #OnThisDay, January 29th, 1843. At 18 years old, he enlisted in the 23rd Ohio Regiment to fight in the Civil War. When the war ended, he was drawn into politics and began his career in the House of Representatives. He lost his seat in 1890 but received the Republican presidential nomination and won, making him the 25th U.S. President. His term is remembered for its foreign policy, including the annexation of the Hawaiian Islands and the acquisition of Puerto Rico, Guam, and the Philippines from Spain. 

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