All 4 contributed, but B and D are the most direct causes.
Key events:
1918: world war I ends.
1920: nineteenth amendement ratified.
1928: Herbert Hoover elected president.
1929: Stock Market Crash.
1930: Hawley Smoot Tariff passed.
1932: Franklin Roosevelt elected president.
1933: New Deal begins.
Hope this helps.
The Korean War was the first militarized instance of containment, as U.S. and South Korea fought against communist North Korea. ... When the UN Security Council voted to aid South Korea in stopping North Korean aggression, the U.S. agreed to send troops to the Korean Peninsula.
Climate should be a good factor
1865, Jan.
United States House of Representatives passed the joint resolution proposing a thirteenth constitutional amendment abolishing slavery, which the Senate had passed in April 1864.
