The 1920s and 1930s 272. Nativism: severe immigration laws to discourage and discriminate against foreigners, believed to erode old-fashioned American values ? Birth of a Nation? spawned resurgence of the Ku Klux Klan?based on The Clansman Ku Klux Klan ? spread quickly; opposed everything that was not White Anglo-Saxon Protestant (WASP) (and conservative),Stephenson?s faults and jail sentence led to demise ?National Origins Act (1924) ? reduced quota, reduced numbers from eastern and southern Europe, Asians banned, Canadians and Latin Americans exempt ? Sacco & Vanzetti Trial ? prejudiced jury sentenced them to death, caused riots around the world, new trial denied