William McKinley (1843-1901) was the last veteran of the American Civil war to become President of the United States, and the last president to serve in the 19th century. He is remembered for imposing high tariffs on imports to boost domestic prosperity, and for introducing innovative advertising practising in his electoral campaigning. In 1898 he took the country to war with Spain, leading to the acquisition of Puerto Rico, Guam and the Philippines. In the same year, the USA annexed the independent Republic of Hawaii.
McKinley was assassinated by an anarchist in 1901, and was succeeded by his Vice President, Theodore Roosevelt.