What is the connection between ideas about race in the 1920s and U.S.immigration policy during the decade?

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Ideas about race in the 1920s fueled a rise in nativism and a belief in the superiority of certain races. This influenced Congress to pass immigration laws that restricted immigration, particularly from southern and eastern Europe, which were considered "undesirable" races. The Immigration Act of 1924 set quotas for immigration based on nationality, effectively reducing the numbers of immigrants who could enter the United States. Ironically, the law permitted unrestricted immigration from the Western Hemisphere, which included Mexico, where many people were of mixed race or had indigenous ancestry.

What Is the Connection Between Ideas About Race in the 1920s