Which law made it harder for some europeans to immigrate to the united states and easier for others?

The Johnson-Reed Immigration Act, 1924

Explanation:

The Johnson-Reed Immigration Act was passed making it harder for some Europeans to immigrate to the US, and made somewhat easier for other countries to move the US

The Immigration Act of 1924, also called as the Johnson-Reed Act, was a law of the federal that was passed on May 16, 1924 in the USA intended to limit immigration of population in the US. It, the law banned entry of the entire Chinese population and put strict restrictions to other Asian immigrant groups, and to a fewer extent, on people from Eastern and Southern Europe; but it did not apply to persons from the American continent.