may 18, 1917 - Congress enacts Selective Service Act of 1917
Description:
At the time the U.S army paled in comparison to the armies in the various theaters of war so Congress passes bill authorizing the Federal Government to raise an army to enter World War One.
Source:
Wikipedia, "Selective Service Act of 1917"
(https://en.wikipedia.org/wiki/Selective_Service_Act_of_1917)
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