During the presidency of James K. Polk, the United States fought a war with Mexico and resolved a dispute with Britain over the division of the Oregon Territory. As a result, the United States

Question

A.
increased in size by more than a third.
B.
acquired its last contiguous territory.
C.
nearly doubled its population.
D.
established its modern southern border

Answer 1

The correct answer is A. increased in size by more than a third.

During James K. Polk's presidency, the Mexican-American War (1846-1848) led to the U.S. acquiring a significant amount of territory, including present-day California, Nevada, Utah, Arizona, and parts of Colorado and New Mexico, which resulted in a substantial increase in the country's size. The resolution of the Oregon boundary dispute with Britain also contributed to this expansion, though to a lesser extent. Overall, the territorial gains during Polk's presidency resulted in a significant increase in the land area of the United States.