Thomas Hart Benton, nicknamed "Old Bullion", was a United States Senator from Missouri. A member of the Democratic Party, he was an architect and champion of westward expansion by the United States, a cause that became known as Manifest Destiny. Benton served in the Senate from 1821 to 1851, becoming the first member of that body to serve five terms.
Benton was born in Harts Mill, Orange County, North Carolina. After graduating from the University of North Carolina, he established a law practice and plantation near Nashville, Tennessee. He served as an aide to General Andrew Jackson during the War of 1812 and settled in St. Louis, Missouri, after the war. Missouri became a state in 1821 and Benton won election as one of its inaugural pair of United States Senators. The Democratic-Republican Party fractured after 1824 and Benton became a Democratic leader in the Senate, serving as an important ally of President Jackson and President Martin Van Buren. He supported Jackson during the Bank War and proposed a land payment law that inspired Jackson's Specie Circular executive order.
Benton's prime concern was the westward expansion of the United States.