Why were new immigration laws passed in 1920s?

The new Immigration laws passed in the 1920s, such as the Emergency Quota Act of 1921 and the Immigration Act of 1924 (National Origins Act), were implemented to restrict and limit the number of immigrants entering the United States. These laws were largely driven by nativist sentiments, economic concerns, and fears of losing traditional American values due to the influx of immigrants from Southern and Eastern Europe. The laws favored immigrants from Northern and Western Europe while severely limiting immigration from other regions.