USA HISTORY

Detailed explanation-1: -He linked the Texas issue, popular in the South, with the Oregon question, attractive to the North. Polk also favored acquiring California. Even before he could take office, Congress passed a joint resolution offering annexation to Texas.

Detailed explanation-2: -Under Polk, Manifest Destiny was put into action with the annexation of the nominally independent Texas and the ceding from Mexico of parts of nine states.

Detailed explanation-3: -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-4: -In July 1845, however, Polk proposed a compromise to the British, offering to establish the boundary at the 49th parallel while granting Britain full control of Vancouver Island. With war in Mexico appearing ever more likely, the President wanted to avoid a simultaneous war with Britain.