WHAT ALL HAPPENED FEBRUARY TO MAY 1937
Find out what all happened February to May 1937

Memorial Day massacre: Chicago police shoot and kill 10 labor demonstrators. (30. May 1937)

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

Hindenburg disaster: The German zeppelin Hindenburg catches fire and is destroyed within a minute while attempting to dock at Lakehurst, New Jersey. Thirty-six people are killed. (6. May 1937)

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

In California, the Golden Gate Bridge opens to pedestrian traffic, creating a vital link between San Francisco and Marin County, California. (27. May 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: Spanish Republican forces defeated the Italians at the Battle of Guadalajara. (18. March 1937)

President Franklin D. Roosevelt proposes a plan to enlarge the Supreme Court of the United States. (5. February 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)

Sir Frank Whittle ground-tests the first jet engine designed to power an aircraft, at Rugby, England. (12. April 1937)

Yekatit 12: During a public ceremony at the Viceregal Palace (the former Imperial residence) in Addis Ababa, Ethiopia, two Ethiopian nationalists of Eritrean origin attempt to kill viceroy Rodolfo Graziani with a number of grenades. (19. February 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 League of Nations bans foreign national "volunteers" in the Spanish Civil War. (21. February 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 New London School explosion killed 300 people, mostly children. (18. March 1937)

A Soviet station, North Pole-1, becomes the first scientific research settlement to operate on the drift ice of the Arctic Ocean. (21. May 1937)

Spanish Civil War: The Battle of Guadalajara begins. (8. March 1937)

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

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