Final answer:
In U.S. history, anti-immigrant sentiments have periodically risen in response to demographic changes, cultural differences, and economic concerns, leading to discriminatory practices and restrictive immigration policies.
Step-by-step explanation:
Throughout the history of the United States, anti-immigrant feelings have surfaced in various periods, influenced by economic, cultural, and political factors. In the early 20th century, the influx of immigrants from Southern and Eastern Europe sparked nativism, leading to restrictive policies like the Emergency Quota Act of 1921 and the Immigration Act of 1924. The Dillingham Commission report, which presented immigrants in a negative light, and discriminatory incidents such as the Anti-Greek Riot of 1909, exemplify the targeted discrimination against these groups. Similar patterns of hostility reemerged against new immigrant waves from Asia and Mexico since 1970, influenced by a rise in national security concerns and sensational media coverage of immigrant-related crimes.