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The Mason–Dixon line is a demarcation line separating four U.S. states: Pennsylvania, Maryland, Delaware and West Virginia. It was surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon as part of the resolution of a border dispute involving Maryland, Pennsylvania, and Delaware in the colonial United States. [1]
The diagram shows the survey lines involved in the disputes, not current borders. The Twelve-Mile Circle is an approximately circular arc that forms most of the boundary between Delaware and Pennsylvania. It is a combination of different circular arcs that have been feathered together. [1] [2]
The Transpeninsular Line (at approximately 38°27′ N) is a surveyed line, the eastern half of which forms the north–south border between Delaware and Maryland. The border turns roughly north from the midpoint of the line towards the Twelve-Mile Circle, which forms much of the remainder of the Delaware land border.
Delmar, Maryland, part of the Salisbury Urbanized Area, lies across the Maryland-Delaware border from its twin, Delmar, Delaware, on the Transpeninsular Line. Dover, Delaware, is the Delaware state capital and the peninsula's largest city in terms of population. It is also the county seat of Kent County, DE and is home to Delaware State University.
The Wedge (or Delaware Wedge) is a 1.068-square-mile (684-acre; 2.77 km 2) [1] tract of land along the borders of Delaware, Maryland and Pennsylvania. Ownership of the land was disputed until 1921; it is now recognized as part of Delaware. [ 2 ]
The Delaware Boundary Markers historic district is located along the state boundary lines between Delaware and Maryland, and between Delaware and Pennsylvania.The district includes 94 contributing sites along the Mason–Dixon line and includes the Transpeninsular Line, Post Marked West site, Tangent Line, the Arc Corner, and the Twelve-Mile Circle.
With the proposal of the U.S. Highway System in 1925, US 13 was planned as one of three routes to pass through Delaware, running from the Maryland border in Delmar via Dover and Wilmington to the Pennsylvania border in Claymont. [28] US 13 was designated on November 11, 1926. [2]
Route 54 eastbound concurrent with DE 26 eastbound past the Maryland border near Gumboro, Delaware The first non-concurrent portions of Route 54 to be numbered were in Maryland in 1939, when MD 467 was marked on the portion around Mardela Springs and MD 455 was marked on the portion around Delmar, which extended from where Waller Road fully ...