Various events after World War I, such as the recession of 1920 to 1921, the First Red Scare, the resurgence of the Ku Klux Klan, the furor surrounding the trial of Sacco and Vanzetti, and organized opposition to immigration intensified the "clash of cultures." The Emergency Quota Act of 1921 limited immigration to three percent of the number of immigrants of any particular country that had been living in the United States in 1910, which only partially stemmed the flow. Three years later, Congress passed a more stringent law, the Immigration Act of 1924, by an overwhelming majority. This law restricted new arrivals to just two percent of foreign-born residents according to the Census of 1890, when the number of "new" immigrants was relatively small. As a result, immigration law all but eliminated the flow of immigrants from southern and eastern Europe, and it effectively excluded all immigration from most of Asia until World War Two. By 1928 immigration had declined to about 300,000, and just over a half million new arrivals entered the U.S. during the entire decade of the 1930s. It was a victory of sorts for those who thought they could protect American culture and institutions by keeping out new and different peoples.