Poll: Which 19th century American President was the most responsible for starting a war?

The poll has closed for the question, "Which 19th century American President was the most responsible for starting a war?" Thanks to all who participated by voting.

President Polk came in first for the Mexican War with 47%. President Lincoln was second for the American Civil War with 18%. President Madison and the War of 1812 was a close third with 17%. Coming in as a close fourth was President McKinley and the Spanish-American War.