Answer:
The Appalachian Mountains
Explanation:
The Appalachian Mountains formed a natural boundary to the west. The geography and climate of the thirteen colonies separated them into three different regions: New England, the Middle Colonies, and the Southern Colonies. New England Coast Rocky coasts are common in New England.
Sojourner Truth,<span> a famous figure of the anti-slavery movement, gave speeches criticizing slavery throughout New England and the West, drawing large crowds wherever she went.</span>
The answer for this question is: <span>C) Manifest Destiny </span>
Manifest destiny is the attitude that drives American expansion to get as much territory as possible.
This term could be associated with the event because The Mexican american war was started because Mexico rejected American proposal to buy out some of its lands.