Mercer

Mercer, county, west-central New Jersey, U.S., bordered by Pennsylvania to the west (the Delaware River constituting the boundary) and by the Millstone River to the northeast and east. Lowlands of the south and east rise to a hilly piedmont region in the north and west. Oak and hickory are the primary forest species. Algonquian-speaking Delaware Indians ceded control of the region to European settlers in the 17th century. The American Revolutionary War general George Washington...