Pennsylvania is a state located in the northeastern region of the United States. It is the 33rd largest state by area and the 5th most populous state in the country. The state is known for its rich history, including being the birthplace of the Declaration of Independence and the Constitution. It is also home to several major cities, including Philadelphia, Pittsburgh, and Allentown. Pennsylvania is known for its diverse geography, including the Appalachian Mountains, the Pocono Mountains, and the Delaware River. The state is also known for its agriculture, with dairy farming being a major industry. Pennsylvania is home to several prestigious universities, including the University of Pennsylvania and Penn State University.