The Mason-Dixon line, which came to symbolise the cultural boundary between the Northern and Southern United States, was originally surveyed to define the border between Maryland and which other state?
Mason–Dixon line use when the Missouri Compromise named "Mason and Dixon's line" as part of the boundary between slave territory and free territory. In popular usage to people from the Northern United States, the Mason–Dixon line symbolizes a cultural boundary between the North and the South (Dixie). However, for many people who identify as Southern, Maryland is not considered a Southern state, leading to confusion over terminology (for more on Maryland's position as southern or northern, see the Region section of the article on Dixie). Originally "Mason and Dixon's Line" referred to the border between Pennsylvania and Maryland. After Pennsylvania abolished slavery,
Transpeninsular Line halfway between Delmar and Mardela Springs, Maryland. This marker is also the southern endpoint of the Mason–Dixon Line. Transpeninsular Line 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. In 1751, a line was surveyed straight across the Delmarva Peninsula beginning at what at least some early Swedish settlers called "Cape Hinlopen", which was to be the southern boundary