They lose their highly educated citizens to the U.S.
The correct answer to this open question is the following.
What caused West Africans to transition from controlling the exchange of goods to European slave raiders was the fact that European powers such as Great Britain, Spain, or Portugal directly competed to acquire the control of the slave trade of African people.
Everything started with John Hawkins, considered to be the first European slave trader in 1562. Years later the government of Englan granted charters to merchants and traders to open locations in West Africa where they could exploit the raw materials and natural resources such as ivory and gold. Because of this, England started to get more competition from other European nations such as Switzerland, the Dutch, and Denmark.
Non-separating Puritans played leading roles in establishing the Massachusetts Bay Colony in 1629, the Saybrook Colony in 1635, the Connecticut Colony in 1636, and the New Haven Colony in 1638.
