Answer:
The correct answer is 3: The fear that American values were threatened by radical ideas.
Explanation:
To begin with, the Palmer Raids were a series of raids that took place from November 1919 until January 1920, which main purpose was to capture and arrest suspected radical leftists, mostly immigrants and especially anarchists and communists, so the deportation process would take place for them.
Secondly, Sacco and Vanzetti were two italian migrant anarchists who were convicted of murdering a guard and a paymaster in the year of 1920 in an armed robbery and went to trial.
And finally, the Inmigration Act of 1924 was a United States federal law that prevented immigration from Asia, set quotas on the number of maximum immigrants that were allowed to inmigrate to the country.
In addition, by that period the First Red Scare was happening, so therefore that many Americans believed that bringing in more immigrants would allow radical ideas to take place over the nation and so the xenophobia spreaded around as well by that time.
