With a number of cultural and economic objectives in mind, governments curtailed immigration in the 1920s.
Reducing the proportion of low-skilled workers in the American workforce was one economic objective since it would enable industry to shift toward higher-skilled, more productive industrial activity.
The Immigration Act of 1924 set a national origins quota that restricted the amount of immigrants who may enter the country. As per the 1890 census, there were 2% of each nationality's total population in the United States who qualified for immigration visas.
CAUSE: Immigrants came to the US in search of a better life, to avoid poverty, discrimination based on religion, etc. EFFECT: a growing population, crowded cities, factory labor, etc.
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