Pennsylvania Colony was an English proprietary colony established in 1681 when King Charles II granted a royal charter to William Penn, a Quaker and son of the English admiral Sir William Penn, in partial settlement of a debt the Crown owed to the elder Penn's estate. The colony encompassed a large tract of land in the mid-Atlantic region of North America, bounded roughly by the Delaware River to the east and extending westward into territory inhabited by various Lenape and Iroquois peoples. Penn named the territory Sylvania (woodland), with the prefix Penn added at the king's insistence to honor the elder Penn - William Penn himself reportedly found the combination presumptuous. The colony's southern boundary was long disputed with Maryland, a conflict eventually resolved by the Mason-Dixon Line survey of 1763-1767. Pennsylvania was organized as a proprietorship, meaning Penn and his heirs held governing authority subject to Crown oversight, rather than as a royal colony governed directly by the Crown.

Penn conceived the colony partly as a commercial venture and partly as a “holy experiment” - a settlement in which Quaker principles of religious tolerance, pacifism, and plain governance could be put into practice at scale. The Frame of Government Penn drafted in 1682 guaranteed freedom of conscience to all who believed in one God, making Pennsylvania unusual among English colonies in extending legal toleration to religious minorities including Jews, Catholics, and dissenting Protestant sects. This policy attracted immigration from across the British Isles and the European continent, particularly from German-speaking regions; settlers from the Rhineland, Palatinate, and Switzerland arrived in large numbers throughout the early eighteenth century and came to be known collectively as the Pennsylvania Dutch (from Deutsch).

The colony's capital, Philadelphia, was laid out by Penn on a grid plan between the Delaware and Schuylkill rivers and grew rapidly into one of the largest cities in British North America. Penn's dealings with the Lenape (Delaware) people, particularly the treaties negotiated at Shackamaxon, have been widely characterized as more equitable than those of neighboring colonies, though historians differ on how meaningfully this distinction held in practice as the colony expanded and Penn's successors took control. Penn spent relatively little time in Pennsylvania himself and died in England in 1718, leaving the proprietorship to his heirs in circumstances complicated by financial debts and family disputes.

Pennsylvania's governance evolved through several constitutional revisions. The Charter of Privileges of 1701 remained the colony's fundamental law until the Revolution, establishing a unicameral legislature with broad powers and a governor appointed by the proprietors. Quakers held dominant political influence in the assembly through much of the colonial period, which produced persistent tension over military appropriations - Quaker pacifist principles conflicted with Crown expectations that the colony contribute to colonial defense, particularly during the French and Indian War. The western counties, populated largely by Scots-Irish and German settlers, increasingly resented the eastern Quaker establishment's control of the legislature and its reluctance to fund frontier defense, a conflict made vivid by the Paxton Boys uprising of 1763.

The colony's economy rested on grain agriculture, trade, and a growing artisan and merchant class centered in Philadelphia. Pennsylvania's labor system differed from the southern colonies in its relative dependence on indentured servitude and wage labor rather than enslaved African labor, though slavery was practiced in the colony and the city of Philadelphia. Quaker antislavery sentiment was present from early in the colony's history and produced one of the earliest formal antislavery protests in North America, the Germantown Petition of 1688, though organized abolitionism remained a minority position until later in the eighteenth century.

By the 1760s and 1770s, Philadelphia had become a center of colonial political life. The city hosted both the First Continental Congress (1774) and the Second Continental Congress (1775-1781), and the Declaration of Independence was adopted there on 4 July 1776. Pennsylvania's transition from colony to state was contested; the proprietorial and conservative elements resisted independence longer than the radical Whig faction, and the Pennsylvania Constitution of 1776 - adopted at the same moment as independence - was among the most democratic of the new state constitutions, abolishing property requirements for voting among free men. Pennsylvania ratified the federal Constitution on 12 December 1787, becoming the second state to do so.

There is broad scholarly consensus on the basic chronology and institutional structure of Pennsylvania Colony. Interpretive questions - including the nature of Penn's relations with Native peoples, the significance of Quaker pacifism to colonial politics, and the extent to which Pennsylvania's religious tolerance was genuinely inclusive - are subjects of ongoing historical debate. See the historical consensus page for sourced summary of areas of agreement.

• The "Holy Experiment" as Genuine Innovation - The view that Penn's religious tolerance and approach to Native relations represented a meaningfully distinct and morally significant departure from English colonial norms.
• Pennsylvania as Standard Colonial Project - The view that Penn's proprietorship, despite its rhetoric, replicated the land dispossession and hierarchical social structures common to other English colonies.
• Quaker Political Influence: Principled or Self-Serving - Debate over whether Quaker dominance of the colonial assembly reflected genuine religious principle or served as a vehicle for the interests of a prosperous merchant elite.

• Pennsylvania Colony - History
• Pennsylvania Colony - Debate
• William Penn
• Quakers
• Philadelphia
• Mason-Dixon Line
• Pennsylvania Dutch
• Paxton Boys
• Germantown Petition of 1688
• French and Indian War
• American Revolution
• Declaration of Independence
• Tenth Amendment - for context on state sovereignty and the federal structure Pennsylvania helped shape

1. Soderlund, Jean R., ed. William Penn and the Founding of Pennsylvania, 1680-1684: A Documentary History. University of Pennsylvania Press, 1983.
2. Bronner, Edwin B. William Penn's “Holy Experiment”: The Founding of Pennsylvania, 1681-1701. Temple University Publications, 1962.
3. Nash, Gary B. Quakers and Politics: Pennsylvania, 1681-1726. Princeton University Press, 1968.
4. Merritt, Jane T. At the Crossroads: Indians and Empires on a Mid-Atlantic Frontier, 1700-1763. University of North Carolina Press, 2003.
5. Marietta, Jack D., and G.S. Rowe. Troubled Experiment: Crime and Justice in Pennsylvania, 1682-1800. University of Pennsylvania Press, 2006.
6. Tully, Alan. Forming American Politics: Ideals, Interests, and Institutions in Colonial New York and Pennsylvania. Johns Hopkins University Press, 1994.
7. Jacobson, David L. “The Case Against the American 'Holy Experiment.'” Pennsylvania History 32, no. 2 (1965): 155-168.