The Pequot and Mohegan tribes were formerly a single group, but the Mohegans split off in the 17th century as the Pequots came to control much of Connecticut. Simmering tensions with the New England Colonies led to the Pequot War of 1634–1638, which dramatically reduced the population and influence of the Pequots; many members were killed, enslaved, or dispersed. Small numbers of Pequots remained in Connecticut, receiving reservations at Mashantucket in 1666 and at the Pawcatuck River in 1683; others lived in other areas and with other tribes. In the 18th century, some Christian Pequots joined members of several other tribes to form the Brothertown Indians. They relocated to western New York in the 19th century and later to Wisconsin.