What gave the president authority to grant Eastern American Indian tribes the unsettled lands west of the Mississippi River in exchange for their ancestral lands in the East? A) Indian Removal Act B) Trail of Tears C) Treaty of the Five Civilized Tribes D) Treaty of Canandaigua

U.S. President Andrew Jackson oversaw the policy of "Indian removal," which was formalized by the signing of the Indian Removal Act in May 1830.

Explanation:

The Indian Removal Act was put in place to give to the southern states the land that belonged to the Native Americans.

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.