1784 - 1850
So far as it is possible to be informed, I shall make honesty, capacity, and fidelity indispensable prerequisites to the bestowal of office, and the absence of either of these qualities shall be deemed sufficient cause for removal. Inaugural Address
At the time he became President, Zachary Taylor was the most popular man in America, a hero of the Mexican-American War. However, at a time when Americans were confronting the explosive issue of slavery, he was probably not the right man for the job. Taylor was a wealthy slave owner who held properties in the plantation states of Louisiana, Kentucky, and Mississippi. During his brief time in office—he died only sixteen months after his election—his presidency foundered over the question of whether the national government should permit the spread of slavery to the present-day states of California, New Mexico, and Utah, then newly won from Mexico. His sudden death put Vice President Millard Fillmore into the White House, and Fillmore promptly threw his support behind the Compromise of 1850, canceling out much of the impact of Taylor's presidency.
James Knox Polk and the war with Mexico
From our Historical Presidency Series, Professor Daniel Walker Howe examines President Polk’s management of the war with Mexico