Pennsylvania, officially the Commonwealth of Pennsylvania, is one of the 13 original founding states of the United States; it was originally founded in 1681 as a result of a royal land grant to William Penn, the son of the state’s namesake. It was the second state to ratify the United States Constitution, on December 12, 1787. Independence Hall, where the United States Declaration of Independence and United States Constitution were drafted, is located in the state’s largest city of Philadelphia. In all, Pennsylvania is home to fifty Fortune 500 companies, Pittsburgh is home to eight Fortune 500 companies, including U.S. Steel, PPG Industries, and H.J. Heinz, as well as, Erie which is home to GE Transportation Systems, the largest producer of train locomotives in the United States. The Appalachian Mountains run through the middle of Pennsylvania and the commonwealth borders Delaware to the southeast, Maryland to the south, West Virginia to the southwest, Ohio to the west, Lake Erie and the Canadian province of Ontario to the northwest, New York to the north, and New Jersey to the east.