Every one of them had to move from there homes and had lost loved ones along the way they had little to no food little to no shelter and some had kids which only tore them even more
The answer is:
1.) Russian second front against Germany.
2.) German post war division.
3.) Soviet assistance against japan.
4.)Post war international organization.
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I hope this helps :D
Because slaves did all the work white people felt like the didnt have to do so slaves did all the work