Why did the Republican Party favor restrictions on immigration in the 1920s?

To preserve the ideal of American identity

Explanation:

Beginning at the end of the 19th century, immigration into the United States went high. Many of these new immigrants came from eastern and southern Europe. Many immigrants with different languages, customs, and religions caused anxiety and racial hostility. The sense of fear and concern over the rising of immigration led the Republican Party in 1920 to put restrictions.