Which act formalized the exclusive definition of whiteness by imposing immigration restrictions based on a national origins quota system that limited the yearly number of immigrants from each country

Immigration Act of 1924

Explanation:

Many countries especially those in Europe, some Asia and North America do restrict or limit the number of persons that come into their countries, this is done to avoid overpopulation, lack of control, crime, and inability to cater for those coming into their sphere. The Act was implemented in 1924 and it's been referred to as Immigration Act of 1924.