What populations of non-Americans were left in the new territory acquired by the U. S.? What happened
to them?

Despite this sectional conflict, Americans kept on migrating West in the years after the Missouri Compromise was adopted. Thousands of people crossed the Rockies to the Oregon Territory, which belonged to Great Britain, and thousands more moved into the Mexican territories of California, New Mexico and Texas. Nonetheless, there were still more Anglo settlers in Texas

Explanation:

e imma say squidward tentacles

treating native americans justly and giving them equal rights as citizens of the united states" was not a way in which americans sought to solve the indian problem. removal was the most popular idea.