The non-separatist Puritans constituted a much larger group than the Pilgrims, and they established the Massachusetts Bay Colony in 1629 with 400 settlers. They sought to reform the Church of England by creating a new, pure church in the New World. By 1640, 20,000 had arrived; many died soon after arrival, but the others found a healthy climate and an ample food supply. The Plymouth and Massachusetts Bay colonies together spawned other Puritan colonies in New England, including the New Haven, Saybrook, and Connecticut colonies. During the 17th century, the New Haven and Saybrook colonies were absorbed by Connecticut.