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Westchester, county, southeastern New York state, U.S., lying just north of New York City. It consists of a hilly region bounded to the east by Connecticut, to the southeast by Long Island Sound, and to the west by the Hudson River. The original inhabitants of Westchester, Algonquian-speaking Wappinger Indians, were displaced in the 1640s by Dutch colonists along the Hudson and by colonists from New England along what is now the Connecticut border; most of...