What was President Polk's attitude towards the idea of Manifest Destiny? A. He was a supporter of American territorial expansion. B. He was against using money to buy territory. C. He was in favor of expansion but through peaceful means only. D. He was against territorial expansion.

The correct answer is A. He was a supporter of American territorial expansion.

President Polk sought ways to secure the British territory of Oregon for U. S. expansion but it worsens its relation with the Mexican government. He decided a quick war is needed when Mexico refused to sell their territories to the United States and used the concept of Manifest Destiny towards Mexican people to bring the American public on board.