Opposition to the absorption of millions of immigrants from Southern and Eastern Europe was especially strong among popular writers such as Madison Grant and Lothrop Stoddard, who believed in the "racial" superiority of Americans of Northern European descent as member of the "Nordic race", and therefore demanded immigration restrictions to stop a "degeneration" of America's white racial "stock". They believed that complete cultural assimilation of the immigrants from Southern and Eastern Europe was not a solution to the problem of immigration because intermarriage with these immigrants would endanger the racial purity of Anglo-America. The controversy over immigration faded away after immigration restrictions were put in place with the enactment of the Johnson-Reed Act in 1924.