Answer: This has to do with push and pull immigration. Factors like floods, famine, war, persecution, etc. might push people out of their native countries. Economic opportunities, religious freedom, etc. might pull people to immigrate to another country. Because the factors in each country are different at different times this affects the rate of immigration. Also immigration patterns are tied into policies about race and ethnicity. Since the very beginning of immigration immigrants have been discrimnated against and "othered." Massive European immigration occurred during the latter half of the 1800s. At the turn of the 20th century groups of Asians were restricted from entering the U.S. and in 1924 quotas were established to limit the number of Eastern European immigrants in favor of more Western Europeans.
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