Zachary Taylor (November 24, 1784 - July 9, 1850) was an American military leader and the twelfth President of the United States. Taylor had a 40-year military career in the U.S. Army, serving in the War of 1812, Black Hawk War, and Second Seminole War before achieving fame while leading U.S. troops to victory at several critical battles of the Mexican-American War. Taylor's short Presidency was shadowed by the issue then dominating all aspects of American national affairs - that of slavery. However, the immediate issue was the admission of New Mexico and California as states. Taylor confounded his Southern supporters, who had assumed that since the President owned slaves, he would support the pro-slavery position and refuse entry into the union to two states settled by Northerners and likely to be anti-slavery. Taylor recommended that the two territories develop their own constitutions and then request admission based on those constitutions. When Southern states threatened secession he warned them that he would use all his resources as commander-in- chief to preserve the union. He stated that if they seceded he would track them down like he had the Mexicans, and handle them in the same manner that he had deserters. Taylor's brief term in the White House also featured the still on-going question of balancing power between the Congress and the presidency.