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Migration is when you move from one place to another.
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Some reasons are:
War
Family Priorities
Climate
Better education -
WW1 start in 1914 and it ended in 1918. During WW1 people mostly migrated to United States Of America(USA)
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WW2 lasted from 1939 to 1945. During WW2 people mostly migrated to East-Central and Eastern Europe.