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The Mason–Dixon line, also called the Mason and Dixon line or Mason's and Dixon's line, is a
The Mason–Dixon line, also called the Mason and Dixon line or Mason's and Dixon's line, is a demarcation line
{{Refimprove, date=January 2008
A political demarcation line is a geopolitical border, often agreed upon as part of an armistice or ceasefire.
Africa
* Moroccan Wall, delimiting the Moroccan-controlled part of Western Sahara from the Sahrawi ...
separating four U.S. states, forming part of the borders of Pennsylvania
Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...
, Maryland
Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean t ...
, Delaware
Delaware ( ) is a state in the Mid-Atlantic region of the United States, bordering Maryland to its south and west; Pennsylvania to its north; and New Jersey and the Atlantic Ocean to its east. The state takes its name from the adjacent ...
, and West Virginia
West Virginia is a state in the Appalachian, Mid-Atlantic and Southeastern regions of the United States.The Census Bureau and the Association of American Geographers classify West Virginia as part of the Southern United States while the ...
(part of Virginia
Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth are ...
until 1863). It was surveyed between 1763 and 1767 by Charles Mason
Charles Mason (April 1728Jeremiah Dixon
Jeremiah Dixon FRS (27 July 1733 – 22 January 1779) was an English surveyor and astronomer who is best known for his work with Charles Mason, from 1763 to 1767, in determining what was later called the Mason–Dixon line.
Early life and ...
as part of the resolution of a border dispute involving Maryland, Pennsylvania, and Delaware in colonial America
The colonial history of the United States covers the history of European colonization of North America from the early 17th century until the incorporation of the Thirteen Colonies into the United States after the Revolutionary War. In the ...
. The dispute had its origins almost a century earlier in the somewhat confusing proprietary
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