The document summarizes several US presidential elections between 1840-1844. In 1840, Whig candidate William Henry Harrison defeated Democrat Martin Van Buren. Van Buren was unpopular due to an economic panic. In 1844, Democrat James K. Polk defeated Whig Henry Clay on a platform of expansionism, which led to the annexation of Texas and war with Mexico. Polk achieved his goals of lowering tariffs, resolving the Oregon boundary dispute, reestablishing the independent treasury, and acquiring California before the end of his term in 1848.