Unit 13 By alebron267 Apr 1, 1923 coolidge becomes president after Harding dies Apr 1, 1924 Coolidge re-elected Apr 1, 1926 US troops occupy Nicaragua Apr 1, 1929 Stock market crashes Apr 1, 1931 Japanese invaded Manchuria Apr 1, 1932 Roosevelt becomes president Apr 1, 1933 21st amendment passed Apr 1, 1935 Social Security Act Apr 1, 1939 Nazi-Soviet Pact Apr 1, 1939 Germany invades Poland Casuing WW2