Battle of Gettysburg, Gettysburg - a battle of the American Civil War (1863); the defeat of Robert E. Lee's invading Confederate army was a major victory for the Union

University of Pennsylvania, Penn, Pennsylvania - a university in Philadelphia, Pennsylvania

American state - one of the 50 states of the United States

Mid-Atlantic states - a region of the eastern United States comprising New York and New Jersey and Pennsylvania and Delaware and Maryland

Allentown - a city in eastern Pennsylvania; an industrial and commercial center

Altoona - a town in central Pennsylvania

Bethlehem - a town in eastern Pennsylvania on the Lehigh River northwest of Philadelphia; an important center for steel production

Erie - a port city on Lake Erie in northwestern Pennsylvania

Gettysburg - a small town in southern Pennsylvania; site of a national cemetery

capital of Pennsylvania, Harrisburg - capital of Pennsylvania; located in southern part of state

Chester - a city of southeastern Pennsylvania on the Delaware river (an industrial suburb of Philadelphia)

City of Brotherly Love, Philadelphia - the largest city in Pennsylvania; located in the southeastern part of the state on the Delaware river; site of Independence Hall where the Declaration of Independence and the Constitution were signed; site of the University of Pennsylvania

Pittsburgh - a city in southwestern Pennsylvania where the confluence of the Allegheny River and Monongahela River forms the Ohio River; long an important urban industrial area; site of Carnegie-Mellon University and the University of Pittsburgh

Allegheny, Allegheny River - a river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River

Lehigh River - a rive in eastern Pennsylvania that flows southeast into the Delaware River

Monongahela, Monongahela River - a river that rises in northern West Virginia and flows north into Pennsylvania where it joins the Allegheny River at Pittsburgh to form the Ohio River

Susquehanna, Susquehanna River - a river in the northeastern United States that rises in New York and flows southward through Pennsylvania and Maryland into Chesapeake Bay