1 janv. 1921 - 1921 - The Emergency Quota Act established for the first time a cap on the number of immigrants from particular countries in a given year. It established that no more than three percent of the population of a national origin as of the 1910 census could immigrate to the United States per year. This act was passed in response to a flood of Jewish immigrants fleeing persecution in especially Eastern Europe, and was in a sense successful in that it reduced that immigration. Immigration fell as a result of this