The correct answer to this open question is the following.
The colonists provided Europe with raw materials and natural resources. American colonists exported crash crops such as cotton, tobacco, sugar, and rice. England sent them manufactured products. The British monarchy forced the colonist to just sell their goods to England and no other country with the Navigations Acts of 1651. This decision and other taxation acts such as the Sugar Act, the Stamp Act, or the Tea Act, angered the colonists and were causes that initiated the Revolutionary War.