The human race has come up with some odd ideas over the millennia, and national borders are one of them. Sometime during the early Renaissance, rulers essentially decided that the best way to strengthen the state and preserve its wealth was to define it spatially, carving up chunks of land into blocks of varying sizes, where everything from the rules of the road to which government officials are allowed to shoot you changes the second you cross an imaginary line. Many national frontiers hew close to natural boundaries, such as mountains and rivers, but in places where nature doesn’t oblige, it often becomes necessary to express these divides by building the barriers ourselves.

This act isn’t a small undertaking. Some of their scars can be seen from space, and they’ll probably call for a lot of explaining when the aliens do finally arrive to conquer us:

Aerial Borders Mexicali Farms
Aerial Borders Tijuana Beach
Aerial Borders Juarez Elpaso
The Imaginary Lines That Govern Us All: Stunning Photos Of The World’s Borders
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Richard Stockton
Richard Stockton
Richard Stockton is a freelance science and technology writer from Sacramento, California.
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