Final answer:
The Middle Colonies were known as the breadbasket of the 13 colonies due to their fertile soil and favorable climate for agriculture. They supplied grains like wheat, corn, and oats to other colonies.
Step-by-step explanation:
The colonial region that was known as the breadbasket of the 13 colonies was the Middle Colonies. The Middle Colonies, consisting of New York, New Jersey, Pennsylvania, and Delaware, had fertile soil and a favorable climate for agriculture. They grew a variety of crops, including wheat, corn, and oats, which made them a major supplier of grain to the other colonies.
Learn more about Colonial regions in America