Immigration patterns differed by region of origin mainly due to the fact that the economic and social situations of each region were different at each time, with which its inhabitants did not have the need to emigrate to new destinations simultaneously.
- Thus, for example, in the early 1900s the main migratory flows that came to the United States came from southern Europe and Ireland, regions that were economically backward and could not provide their inhabitants with the quality of life that was obtained in America;
- While at present this situation occurs in Latin American and Asian countries, which are the main generators of migrants arriving in the United States.
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Four empires collapsed: the Russian Empire in 1917, the German and the Austro-Hungarian in 1918
Republican and democraric
Vladmir Lenin was the leader