What 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

Explanation:

The Immigration Act of 1924 also called Johnson-Reed Immigration Act was a law that was passed by the US Congress that expressed xenophobia towards eastern and southern European immigrants and made it harder for them to immigrate to the US.

The law created a quota system that was based on national origin, the number of immigrants that could be admitted would be 2% of the total number of individuals from each nationality that resided in the US in 1890.

the real answer is b