The Pequots are a Native American people of Connecticut. Modern Pequots are members of the federally recognized Mashantucket Pequot Tribe, four other state-recognized groups in Connecticut, and the Brothertown Indians of Wisconsin. The Pequots and Mohegans 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 different areas and with other tribes. In the 18th century, some Christian Pequots joined members of several other groups to form the Brothertown Indians. They relocated to western New York in the 19th century and later to Wisconsin. The Mashantucket Pequot Tribe was formed in 1975 and received federal recognition in 1983 as a settlement of a land claim. Much of this culture is exceptionally presented at the Mashantucket Pequot Museum and Research Center in Mashantucket, Connecticut.