The United States entered WWI in April of 1917. Less than a month later, the law below was passed by Congress:
The Selective Service Act of 1917: required registration of all men aged 21 through
30, was intended to supply the military and war-related industries, provided
exemptions for civil servants and clergy, exempted conscientious objectors from
combat, allowed no paid substitutes, 9.9 million men were registered by June and
687, 000 men were immediately inducted.
So many people were required so quickly because the US had previously:

religion played a major role in the american revolution by offering a moral sanction for opposition to the british--an assurance to the average american that revolution was justified in the sight of god. the revolution strengthened millennialist strains in american.

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).

it is based on the same philosophy as health insurance

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