Result - 40th parallel
The Mason-Dixon Line, surveyed by Charles Mason and Jeremiah Dixon, which became a popular name for the dividing line between the slave and free states, is the boundary between which two states of the USA?
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?
What is the name for the large bodies of water that are along the border between Canada and the USA and in southern Canada?
International Date Line, an imaginary line where date changes as one travels east or west across it, passes through which longitude (except some adjustments) ?
