Final answer:
Post-World War I social tensions in the U.S. included the Red Scare, fueled by the Bolshevik Revolution; nativism, intensified by Eastern European Jewish immigration; and race riots, triggered by the Great Migration of African Americans to the North.
Step-by-step explanation:
After World War I, the United States experienced social tensions arising from several factors. The Bolshevik Revolution allowed communists to come to power in Russia, which triggered widespread fear in the U.S. This hysteria became known as the Red Scare, characterized by a fear that communist infiltrators intended to overthrow the government.
Over two million Jews immigrating to America from Eastern Europe contributed to sentiments of nativism, where the influx of foreigners led to distrust and a desire to favor native-born Americans over immigrants.
The Great Migration, which was a mass movement of African Americans relocating to the North for factory jobs, exacerbated racial tensions that manifested in race riots. These riots were expressions of violence and conflict rooted in the societal changes caused by the migration and the associated competition over jobs and social status.