1930
- Gandhi's Salt March
- Pluto Discovered
- Stalin Begins Collectivizing Agriculture in the U.S.S.R.
1931
- Al Capone Imprisoned for Income Tax Evasion
- Auguste Piccard Reaches Stratosphere
- Christ Monument Built on Rio de Janeiro Hilltop
- Empire State Building Completed
- Scottsboro Boys Accused of Rape
- U.S. Officially Gets National Anthem
1932
- Air Conditioning Invented
- Amelia Earhart First Woman to Fly Solo Across the Atlantic
- Lindbergh's Baby Kidnapped
- Scientists Split the Atom
- Zippo Lighters Introduced
1934
- Bonnie and Clyde Killed by Police
- Cheeseburger Created
- The Dust Bowl
- Mao Zedong Begins the Long March
- Parker Brothers Sells the Game "Monopoly"
1935
- Alcoholics Anonymous Founded
- Germany Issues the Anti-Jewish Nuremberg Laws
- John Maynard Keynes Suggests New Economic Theory
- Social Security Enacted in U.S.
1936
- Carnegie Publishes How to Win Friends and Influence People
- Hoover Dam Completed
- King Edward VIII Abdicates
- Nazi Olympics in Berlin
- Spanish Civil War Begins