Daniel Webster was an American politician who represented New Hampshire and Massachusetts in the United States House of Representatives; served as a Senator from Massachusetts; and was the United States Secretary of State under Presidents William Henry Harrison, John Tyler, and Millard Fillmore. He and James G. Blaine are the only people to serve as Secretary of State under three presidents. Webster also sought the Whig Party nomination for President in 1836, 1840, and 1852.
Webster was one of the most highly regarded courtroom lawyers of the era. He shaped several key U.S. Supreme Court cases that established important constitutional precedents and bolstered the authority of the federal government. As a senator, he was a spokesman for American nationalism with powerful oratory that made him a key Whig leader. He spoke for conservatives and led the opposition to Democrat Andrew Jackson and his Democratic Party, firmly challenging Jackson's policies in the Bank War. As a diplomat, he is best known for negotiating the Webster–Ashburton Treaty of 1842 with Great Britain which established the Canada–United States border east of the Rocky Mountains.