Which group was treated most favorably by 1920s immigration laws?

The 1920s Immigration laws, particularly the Immigration Act of 1924, favored immigrants from Northern and Western Europe, specifically countries like Great Britain, Germany, and the Scandinavian nations. These laws established quotas that significantly restricted immigration from Southern and Eastern Europe, as well as from Asia and Africa. This preference reflected the nativist attitudes of the time, which prioritized certain ethnic groups over others.