Here are the answers to your questions:
Question 1: "Manifest Destiny" refers to the belief that ___ had given the U.S. a mission and right to extend civilization across the continent.
Answer: B God
Question 2: The idea of territorial expansion and Manifest Destiny brought the U.S. into armed conflict with ___ in 1846.
Answer: C Mexico
Question 3: What three types of progress are illustrated in American Progress by John Gast?
Answer: A agricultural, industrial, legal