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The coat of arms of Pennsylvania

Pennsylvania (/ˌpɛnsɪlˈvniə/ PEN-sil-VAY-nee-ə, lit.'Penn's forest country'), officially the Commonwealth of Pennsylvania (Pennsylvania Dutch: Pennsilfaani), is a U.S. state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest, Ohio and the Ohio River to its west, Lake Erie and New York to its north, the Delaware River and New Jersey to its east, and the Canadian province of Ontario to its northwest via Lake Erie.

Pennsylvania was founded in 1681 through a royal land grant to William Penn, the son of the state's namesake. Prior to that, between 1638 and 1655, a southeast portion of the state was part of New Sweden, a Swedish Empire colony. Established as a haven for religious and political tolerance, the colonial-era Province of Pennsylvania was known for its relatively peaceful relations with native tribes, innovative government system, and religious pluralism.

Pennsylvania played a vital and historic role in the American Revolution and the ultimately successful quest for independence from the British Empire, hosting the First and Second Continental Congress in Philadelphia, which formed the Continental Army and appointed George Washington as its commander in 1775, and unanimously adopted the Declaration of Independence the following year. On December 12, 1787, Pennsylvania was the second state to ratify the U.S. Constitution. (Full article...)

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Priestley Avenue side of the Joseph Priestley House in 2007

The Joseph Priestley House was the American home of eighteenth-century British theologian, Dissenting clergyman, natural philosopher (and co-discoverer of oxygen), educator, and political theorist Joseph Priestley (1733–1804) from 1798 until his death. Located in Northumberland, Pennsylvania, the house, which was designed by Priestley's wife Mary, is Georgian with Federalist accents. The Pennsylvania Historical and Museum Commission (PHMC) operated it as a museum dedicated to Joseph Priestley from 1970 to August 2009, when it closed due to low visitation and budget cuts. The house reopened in October 2009, still owned by the PHMC but operated by the Friends of Joseph Priestley House (FJPH).

Fleeing religious persecution and political turmoil in Britain, the Priestleys emigrated to the United States in 1794 seeking a peaceful life. Hoping to avoid the political troubles that had plagued them in Britain and the problems of urban life they saw in the United States, the Priestleys built a house in rural Pennsylvania. Nevertheless, political disputes and family troubles dogged Priestley during the last ten years of his life. (Full article...)

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Mahoning Creek

Mahoning Creek is a tributary of the Susquehanna River in Columbia County and Montour County, in Pennsylvania, in the United States. It is approximately 10.6 miles (17.1 km) long and flows through Madison Township in Columbia County and West Hemlock Township, Derry Township, Valley Township, Mahoning Township, and Danville in Montour County. The watershed of the creek has an area of 39.6 square miles (103 km2). Its tributaries include Kase Run, Mauses Creek, and Sechler Run. Mahoning Creek is designated as a Trout-Stocking Fishery and a Migratory Fishery for part of its length and as a Warmwater Fishery and a Migratory Fishery for the remainder.

Mahoning Creek is considered by the Pennsylvania Department of Environmental Protection to be impaired by siltation. The main rock formations in the watershed include the Trimmers Rock Formation, the Clinton Group, the Catskill Formation, the Hamilton Group, the Bloomsburg and Mifflintown Formation, the Onondaga and Old Port Formation, and the Wills Creek Formation. The main soils include the Berks-Weikert-Alvira series, the Chenango-Pope-Holly series, the Clymer-Buchanan-Norwich series, and the Leck Kill-Meckesville-Calvin series. Most of the watershed is forested or agricultural land, but there is some developed land. (Full article...)

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Credit: Bryan Y.W. Shin
The University of Pennsylvania in Philadelphia; the first university in the United States and a member of the Ivy League.

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Oil Creek State Park

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Jay Cooke, founder of the bank

Jay Cooke & Company was a U.S. bank that operated from 1861 to 1873. Headquartered in Philadelphia, Pennsylvania, with branches in New York City and Washington, D.C., the bank helped underwrite the Union Civil War effort. It was the first "wire" brokerage house, pioneering the use of telegraph messages to confirm securities transactions with clients. The bank became overextended in the building of the Northern Pacific Railway and failed, contributing to the Panic of 1873. (Full article...)

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Guion Stewart Bluford Jr. (born November 22, 1942) is an American aerospace engineer, retired United States Air Force (USAF) officer and fighter pilot, and former NASA astronaut, in which capacity he became the first African American to go to space. While assigned to NASA, he remained a USAF officer rising to the rank of colonel. He participated in four Space Shuttle flights between 1983 and 1992. In 1983, as a member of the crew of the Orbiter Challenger on the mission STS-8, he became the first African American in space as well as the second black person in space, after Cuban cosmonaut Arnaldo Tamayo Méndez. (Full article...)

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Pennsylvania's largest city Philadelphia
  • Nickname: The Keystone State
  • Capital: Harrisburg
  • Largest city: Philadelphia
  • Total area: 119,283 square kilometers (46,055 square miles)
  • Population (2000 census): 12,281,054
  • Date admitted to the Union: December 12, 1787 (2nd)
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Mountain laurel, Pennsylvania's state flower

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