The Mid-Atlantic, also called Middle Atlantic states or the Mid-Atlantic states, form a region of the United States generally located between New England and the South Atlantic States. Its exact definition differs upon source, but the region often includes New York, New Jersey, Pennsylvania, Delaware, Maryland, Washington D.C., Virginia, and West Virginia. When discussing climate, Connecticut (especially southern Connecticut) is often included with the Mid-Atlantic region. The Mid-Atlantic has played an important role in the development of American culture, commerce, trade, and industry.