On December 18, 1950, the Nevada Test Site was established by President Harry Truman. This 680-square-mile area was the primary testing location of American nuclear devices from 1951 to 1992. At this testing site, there were a total number of 1,021 nuclear detonations. The number occurring underground was approximately 921. Whenever these atmospheric tests took place, the clouds could be seen for nearly 100 miles. People staying in downtown Las Vegas could look out their hotel window and see these mushroom-shaped clouds.

Here’s an atomic test as it’s being conducted at the Nevada Test Site in 1955:

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