Why was there a rise in nativism and fundamentalism in the 1920’s?

Following the Bolshevik Revolution in Russia in November 1917, the sense of an inevitable foreign or communist threat grew among those already predisposed to distrust immigrants. The sense of fear and anxiety over the rising tide of immigration came to a head with the trial of Nicola Sacco and Bartolomeo Vanzetti.

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i believe its the indians