USA HISTORY

Detailed explanation-1: -Polk is chiefly known for extending the territory of the United States through the Mexican–American War; during his presidency, the United States expanded significantly with the annexation of the Republic of Texas, the Oregon Territory, and the Mexican Cession following American victory in the Mexican–American War.

Detailed explanation-2: -James Knox Polk was the 11th president of the United States of America (1845-1849). As President he oversaw the largest territorial expansion in American history-over a million square miles of land-acquired through a treaty with England and war with Mexico.

Detailed explanation-3: -James K. Polk oversaw a large territorial expansion of the United States. He advocated for annexation of Texas and aggressively prosecuted the resulting Mexican-American War, which added much of the Southwest and California to the country’s territory.

Detailed explanation-4: -With the Oregon Treaty of 1846, Polk managed another significant land acquisition–this time without going to war–when his administration diplomatically settled a border dispute with the British and gained full control of the present-day states of Washington, Oregon and Idaho, as well as parts of Montana and Wyoming.

Detailed explanation-5: -Under James Knox Polk, the United States grew by more than a million square miles, adding territory that now composes the states of Arizona, Utah, Nevada, California, Oregon, Idaho, Washington, much of New Mexico, and portions of Wyoming, Montana, and Colorado.