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Mason-Dixon line, which represents the cultural border between the Southern and Northern United States.
The Mason-Dixon line, named for Charles Mason and Jeremiah Dixon, the surveyors who mapped it out, was originally the border between the colonies of Pennsylvania, Maryland, Delaware, and Virginia (in present-day West Virginia). The line later was extended westwards, marking the border between slave states and free states.
Yes. The questions is not quite as simple as it sounds, though. The Mason-Dixon Line was the agreed-upon boundary between Maryland and Pennsylvania, and between Maryland and Delaware. It did not mark the boundary between slave and free states when it was drawn in the 1760s -- in fact slavery was legal in all of the colonies at that time. Later, in 1820 (at the time of the Missouri Compromise), the term 'Mason-Dixon Line' came to indicate the cultural and political divide between north and south. Delaware was a slaveholding state at that time, but the slave-keepers were not in control of the political dealings of the state as they were in nearly all other slave states. The Mason-Dixon Line remained a symbol name for the dividing line between free and slave states, and later between north and south when slavery was ended. Most people today (outside of history class) have no idea where the line actually stood or what it really meant. Some of the carved stone markers that Mason and Dixon placed from 1763 to 1767 are still in their original places, with the seals of the Penn family, Maryland, and Delaware still visible. See the related links for an example.
It was the border between Pennsylvania (free soil) and Maryland (slave-state). Beyond that, it had no actual significance.
Besides becoming the border between Maryland and Pennsylvania, Charles Mason and Jeremiah Dixon's line became what separated the states that allowed slavery (Confederate; south) and the states that didn't (Union; north)