Why did President Polk support the U.S. acquisition of both Texas and the entire Oregon Territory?
A: He wanted to provoke a war with Mexico.
B: He needed to win the support of Southern slaveholders.
C: He believed in Manifest Destiny.
D: He wanted to drive Great Britain out of North America.
Polk was in favor of acquiring both Texas and Oregon because he was a firm believer in manifest destiny. ... This belief that it was inevitable that this land would belong to the US prompted the federal government to acquire lands like Texas and Oregon.
