The years 1915-1940 saw the great african-american migration, when millions of african-americans migrated from the south to the north. how did world war i foster this massive migration?

While the army was at war, many jobs opened up that otherwise would not have. The Army took up many workers, and the arms industry expanded.

The south, in the meantime, was stagnating. Traditional employment in the south was working to capacity and the north looked like worthwhile greener pastures.

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explanation:

jim crow law, in u.s. history, any of the laws in which racial was enforced, in the south between the finish of reconstruction in 1877 and the start of the social liberties development during the 1950s.

jim crow was the name of a minstrel routine( jump jim crow) performed starting in 1828 by its creator, thomas dartmouth ("daddy") rice, and by numerous imitators, including on-screen character joseph jefferson.

the term came to be a defamatory sobriquet for african americans and an assignment for their segregated life. the segregation rule was stretched out to parks, graveyards, theaters, and eateries with an end goal to keep any contact among blacks and whites as equivalents.

it was classified on neighborhood and state levels and most broadly with the "separate yet equivalent" choice of the u.s. preeminent court in plessy v. ferguson (1896).