Pennsylvania is a northeastern U.S. state, officially known as the Commonwealth of Pennsylvania, and was one of the original 13 American colonies that formed the United States. It is often called the “Keystone State” because of its central political and geographic role in the early development of the country, especially during the colonial era and the founding of the republic.wikipedia+3
Location and geography
Pennsylvania lies in the Mid-Atlantic and Northeastern regions and also extends into the Appalachian and Great Lakes regions, giving it a very diverse physical setting. It is roughly rectangular, stretching about 300 miles east–west and 150 miles north–south, and is bordered by New York and Lake Erie to the north, New Jersey and New York to the east, Delaware and Maryland to the south, West Virginia to the south and west, and Ohio to the west. The state has no Atlantic Ocean coastline but does have about 51 miles of shoreline on Lake Erie and additional tidal waterfront along the Delaware River that connects to the Delaware Bay. The Appalachian Mountains run diagonally through the state, and about 60 percent of its land area is covered by forests, making it one of the more heavily forested U.S. states.britannica+3
Within this terrain, Pennsylvania includes several distinct regions such as the Allegheny Plateau, the Ridge and Valley region, the Piedmont, the Atlantic Coastal Plain in the extreme southeast, and the Erie Plain along Lake Erie. Major rivers like the Delaware, Susquehanna, and Ohio flow through the state, and features such as the Delaware Water Gap and Allegheny National Forest highlight its mix of mountain passes, wooded plateaus, and river valleys.kids.nationalgeographic+2
Cities and population
Pennsylvania is one of the most populous U.S. states, ranking around fifth nationally with roughly 13 million residents in recent estimates. The capital is Harrisburg, located near the Appalachian foothills along the Susquehanna River, while the largest city by far is Philadelphia in the southeast, a major metropolitan center often referred to as “Philly.” Philadelphia anchors the larger Delaware Valley metropolitan area, and Pittsburgh, in the southwest, is the second-largest city and historically a key industrial and steel-producing hub.ebsco+3
Other important urban centers include Allentown, Reading, and Bethlehem in the eastern part of the state, Scranton and Wilkes‑Barre in the northeast, Lancaster in the southeast, and Erie on the Lake Erie coast in the northwest. These cities collectively reflect the state’s mix of old industrial towns, logistics hubs, and smaller regional centers linked by river valleys and interstate corridors.kids.kiddle+2
History and politics
Pennsylvania was founded in 1681 when King Charles II of England granted the territory to William Penn, a Quaker, who envisioned it as a place for religious tolerance and fair governance. The colony became notable for relatively peaceful relations with Native American groups and for attracting diverse European settlers, including English Quakers, Germans, and Scots‑Irish communities. During the American Revolution, Philadelphia was a political focal point: both the First and Second Continental Congresses met there, and the Declaration of Independence was signed in the city in 1776, followed later by the drafting of the U.S. Constitution.infoplease+3
After independence, Pennsylvania quickly ratified the Constitution in 1787, becoming the second state in the Union, and Philadelphia briefly served as the national capital before Washington, D.C. was established. In the 19th century, the state played a central role in the Civil War, most famously as the site of the 1863 Battle of Gettysburg, which marked a major turning point in favor of the Union. Over time, Pennsylvania developed into a strong manufacturing and transportation center, contributing coal, steel, and other heavy industrial output that underpinned U.S. economic growth during the late 19th and early 20th centuries.wikipedia+3
Economy and key industries
Historically, Pennsylvania’s economy was dominated by coal mining, steel production, and related heavy industries located around Pittsburgh and in the anthracite coal regions. As U.S. industry restructured, the state’s economy diversified, and today it has one of the largest state economies in the country, with major sectors including healthcare, education, financial services, manufacturing, and tourism. Healthcare and higher education are especially important in cities such as Philadelphia and Pittsburgh, where large hospital systems and universities act as anchor institutions.ebsco+1
Tourism also provides billions of dollars in spending annually, drawing visitors to historically significant sites like Independence National Historical Park and the Liberty Bell in Philadelphia, Gettysburg National Military Park, and Valley Forge. Rural attractions and outdoor recreation are equally significant, including the Pennsylvania Dutch region in Lancaster County, the Amish and Mennonite communities, resorts in the Pocono Mountains, and lake and forest destinations such as the Lake Erie shore and the Allegheny National Forest.infoplease+1
Culture and identity
Culturally, Pennsylvania is known for a mix of urban and rural traditions, from Philadelphia’s role in American arts, cuisine, and sports to the distinct Pennsylvania Dutch culture, which includes German‑influenced foodways and conservative Anabaptist religious communities. The state’s nickname, the Keystone State, reflects how it sat at the “center” of the original 13 colonies and later functioned as a key connector between New England, the South, and the Midwest in terms of commerce, migration, and political influence. Its long political history includes participation in major national debates over independence, slavery, industrialization, and labor, leaving a dense legacy of historic buildings, battlefields, and industrial heritage sites.thefactfile+4
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