Immigration restrictions in the early years of the republic were influenced by nationality, ethnicity, and religious biases.
Immigration limitations during the first century of the republic were defined by laws such as the 1921 quota system which restricted immigrants based on nationality and ethnicity. The laws favored immigrants from Western Europe while discriminating against those from Southern and Eastern Europe, particularly Jewish, Polish, Italian, Slavic, and Greek immigrants. Anti-immigrant sentiment targeted non-Protestants and non-whites, contributing to discriminatory practices against certain ethnic and religious groups.
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