Answer: california, new mexico, and texas
Answer:
Post -Civil war reconstruction.
Explanation:
During years the politic of United States was the overseas expansion ( Ocean to ocean).
Many Americans did move to territories in the west and the south. This expansionism always was a force in American History,
But during the time of the civil war while the nation was torn apart, the expansion came to a halt after that time the US started rebuilding and expanding again.
Colonies can provide new goods to the mainland, this bringing in more money
