Answer:
The demand for New World crops in Europe
Step-by-step explanation:
The work needed in plantations in America drove the colonizers into looking for cheaper workers, the native americans in many parts of North America weren´t willing to do that job, so they found in the slave trade in Africa a perfect fit for their need of cheap work force and the demand of the crops that were grown in the new world in Europe founded the need for more and more production.