What artifical boundary seperated parts of the north from part of the south in the eastern parts of the country 1) florida georgia line 2) martin dean line 3) mason-dixon line 4) front bounday

The artificial boundary that seperates North from South is called the Mason Dixon Line. The line was surveyed by Charles Mason and Jeremiah Dixon in 1763-1767 to resolve a border dispute between Maryland, Pennsylvania and Deleware. The line still serves as the demarcation line between these states. It also seperated Notherrn and Southern states during the Civil War.

i think it would be a

answer-the island had airfields that the u.s. military needed.