In 1828, when Andrew Jackson was elected president, he promised to expand the United States westward ... Newly-elected President James K. Polk, rather than retreating, demanded even more concessions.

Some would even consider westward expansion to include American ... It was strongly supported by Democratic nominee James K. Polk, who was a firm believer in Manifest Destiny.

Worth, during the Mexican-American War.1855. Library of Congress. In 1844, President James K. Polk ran on a Democratic platform that supported manifest destiny, the idea that Americans were ...