Mason-Dixon Line Surveyed

Surveyors Charles Mason and Jeremiah Dixon mapped the Maryland-Pennsylvania border in 1767, establishing the Mason-Dixon line after 80 years of feuding between the Penn and Calvert families.

People involved

• Charles Mason
• Jeremiah Dixon

When this happened

Mason-Dixon Line Surveyed occurred in 1767, during the colonial period period of American history.

Where this happened

Mason-Dixon Line Surveyed took place in Maryland. Explore the full history of Maryland and primary source records from this era.

European colonization of North America accelerated after 1600, with England, France, Spain, and the Netherlands establishing competing settlements along the Atlantic coast, the St. Lawrence River, the Gulf of Mexico, and the Mississippi Valley. The first permanent English settlement at Jamestown, Virginia (1607) struggled with starvation and conflict; the Plymouth colony (1620) and the Massachusetts Bay Colony (1630) followed. By the mid-1700s, thirteen English colonies stretched along the Atlantic seaboard, governed through a mix of royal charters, proprietary grants, and elected assemblies. The colonial economy depended on tobacco in Virginia and Maryland, rice and indigo in the Carolinas, and maritime trade in New England — all increasingly reliant on enslaved African labor after 1619. Conflict with Indigenous peoples over land was continuous, punctuated by major wars including King Philip's War (1675–1676) in New England and the Yamasee War (1715–1717) in the South. The French and Indian War (1754–1763), part of the global Seven Years' War, ended French power in North America and left Britain deeply in debt — triggering the taxation disputes that would lead to revolution.

Content adapted from Wikipedia under the Creative Commons Attribution-ShareAlike 4.0 International License. Source: Wikipedia: With Pennsylvania.