Answer:
Unlike New England, the Middle Colonies had richer, less rocky soil, allowing the area to become a major exporter of wheat and other grains. Its large exports led to its constituent colonies becoming known as the Bread Basket Colonies.
The middle colonies included Pennsylvania, New York, New Jersey, and Delaware. Advantaged by their central location, the middle colonies served as important distribution centers in the English mercantile system. New York and Philadelphia grew at a fantastic rate.