Freeing slaves during the civil war led to it. As Sherman was marching to the sea, he freed numerous slaves who now became refugees and joined him in the march. He made the special order because they had to be somewhere since they didn't have any land or property.
Answer:
through the draft authorized by the Selective Service Act of 1917.
Explanation:
Although its constitutionality was unclear at the time of its enactment, the Supreme Court upheld its constitutionality the next year, in 1918. I hope this helped.
