Many blacks moved from the south to northern cities during world war li looking for employment. after the war, a number of them lost their jobs. why did this happen?

In the 1920s, more than 750,000 African Americans left the South--a greater movement of people than had occurred in the Irish potato famine of the 1840s. The large-scale relocation to the Northeast and West brought many other changes with it, as many largely rural people moved into cities for the first time.

could you give me the options ?

i believe it was the shinto