WHAT ALL HAPPENED MARCH TO AUGUST 1937
Find out what all happened March to August 1937

Spanish Civil War: Spanish Republican forces defeated the Italians at the Battle of Guadalajara. (18. March 1937)

Pennsylvania becomes the first (and only) state of the United States to celebrate Flag Day officially as a state holiday. (14. June 1937)

In the Spanish Civil War, Sovereign Council of Asturias and León is proclaimed in Gijón. (24. August 1937)

The Steel Workers Organizing Committee signs a collective bargaining agreement with U.S. Steel, leading to unionization of the United States steel industry. (2. March 1937)

Spanish Civil War: The German Condor Legion, equipped with Heinkel He 51 biplanes, arrives in Spain to assist Francisco Franco's forces. (7. May 1937)

The human-powered aircraft, Pedaliante, flew 1 kilometre (0.62 mi) outside Milan. (18. March 1937)

Amelia Earhart and navigator Fred Noonan are last heard from over the Pacific Ocean while attempting to make the first equatorial round-the-world flight. (2. July 1937)

Great Purge: The Soviet Union under Joseph Stalin executes eight army leaders. (11. June 1937)

The Duke of Windsor marries Wallis Simpson. (3. June 1937)

Chinese Air Force Day: The beginning of air-to-air combat of the Second Sino-Japanese War and World War II in general, when 6 Imperial Japanese Mitsubishi G3M bombers are shot down by the Nationalist Chinese Air Force while raiding Chinese air bases. (14. August 1937)

Spam, the luncheon meat, is introduced into the market by the Hormel Foods Corporation. (5. July 1937)

Spanish Civil War: Guernica (or Gernika in Basque), Spain is bombed by German Luftwaffe. (26. April 1937)

End of the Battle of Brunete in the Spanish Civil War. (26. July 1937)

Ponce Massacre: 18 people and a 7-year-old girl in Ponce, Puerto Rico, are gunned down by a police squad acting under orders of US-appointed Governor, Blanton C. Winship. (21. March 1937)

The Philippines holds a plebiscite for Filipino women on whether they should be extended the right to suffrage; over 90% would vote in the affirmative. (30. April 1937)

The Marihuana Tax Act of 1937 is passed in America, the effect of which is to render marijuana and all its by-products illegal. (2. August 1937)

The Golden Gate Bridge in San Francisco, California, is officially opened by President Franklin D. Roosevelt in Washington, D.C., who pushes a button signaling the start of vehicle traffic over the span. (28. May 1937)

Spanish Civil War: Jaén, Spain is bombed by Nazi forces. (1. April 1937)

Aden becomes a British crown colony. (1. April 1937)

The Battle of Shanghai begins. (13. August 1937)