Answer:
1. World War I
2. The Bolshevik Revolution in Russia
3. The End of World War I
4. Self Proclaimed Anarchists
Explanation:
1 - led many to embrace strong nationalistic and anti-immigrant sympathies
2- led many to fear that immigrants, particularly from Russia, Southern Europe, and Eastern Europe, intended to overthrow the US Government
3- caused production needs to decline and unemployment to rise. Many Workers joined labor unions. Labor Strikes including the Boston Police Strike in September 1919 contributed to fears that radicals intended to spark a revolution
4- mailed bombs to prominent Americans, including the US Attorney General A. Mitchell Palmer and US Supreme Court Justice Oliver Wendell Holmes, Jr.
Hope this helps! :)
