(Yau, April 12), May 19, 1921, the United States enacted immigration law. late nineteenth

, the United States immigration increased rapidly led to the history of the largest waves of immigration. The influx of a large number of immigrants, the fear and anxiety of the American society, the United States increasingly xenophobic tendencies in favor of limiting immigration. May 19, 1921, U.S. President Harding signed the immigration law. Act to limit the amount of immigrants in the United States in 1910, 3% of the number of foreign-born group. After the implementation of the immigration law, immigration to the United States is rapidly decreasing.