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.
C is the correct answer <span />
The modern Agricultural Revolution was started by the increase in farm technology and new ideas like crop rotation.
