Answer:
D: a revolution in Russia
Explanation:
The Bolshevik Revolution in Russia, which led many to fear that immigrants, particularly from Russia, southern Europe, and eastern Europe, intended to overthrow the United States government; The end of World War I, which caused production needs to decline and unemployment to rise.
Q1, Is C...Q3,I'll say #3 or #4....The rest is hard sorry
In premier-presidential systems, the prime minister and his cabinets can only be removed by The Parliament