Shortly after Jamestown was founded, Plymouth was settled. For a couple of decades, the population grew relatively slowly, with the Dutch and the English being the two primary countries colonizing the area, primarily for the fur trade. But in 5 years in the 1630s, New England’s population expanded from 300 to 5000 in a great migration. Soon, people were moving inland, particularly to the Connecticut River valley. Source: Empires, Furs and Fortune.