Delaware is a state in the United States. It is sometimes called the First State because it was the first colony to accept the new constitution in 1787. Its capital is Dover and its biggest city is Wilmington. It is the second smallest state in the United States. The Dutch first settled Delaware. The Swedish then took over in the mid-1600s. Delaware is 96 miles (154 km) long and ranges from 9 miles (14 km) to 35 miles (56 km) across, totaling 1,954 square miles (5,060 km2), making it the second-smallest state in the United States after Rhode Island. Delaware is bounded to the north by Pennsylvania; to the east by the Delaware River, Delaware Bay, New Jersey and the Atlantic Ocean; and to the west and south by Maryland. Delaware is on a level plain, with the lowest mean elevation of any state in the nation.