The Immigration Act of 1924, also known as the Johnson-Reed Act, was a significant piece of legislation in the United States that aimed to limit immigration. It established a quota system that restricted the number of immigrants allowed from each country, favoring Northern and Western European nations while severely limiting those from Southern and Eastern Europe, as well as Asia. The act was influenced by a growing nativist sentiment and concerns about the cultural impact of immigrants. It aimed to preserve the existing demographic composition of the U.S. and reflected the era's restrictive immigration policies, which would shape American immigration for decades.