Which law created quotas that made it harder for southern and eastern Europeans to immigrate to the United States and easier for northern Europeans?

The Johnson-Reed Immigration Act of 1924 set national-origin quotas based on earlier U.S. population figures. This favored immigrants from northern and western Europe while sharply limiting immigration from southern and eastern Europe. The Emergency Quota Act also introduced quotas, but the Johnson-Reed Act is the law known for making this regional preference especially strict.

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