WHAT ALL HAPPENED MARCH TO JULY 1937
Find out what all happened March to July 1937

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

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

Turkey, Iran, Iraq and Afghanistan sign the Treaty of Saadabad. (8. July 1937)

The Kamikaze arrives at Croydon Airport in London – it is the first Japanese-built aircraft to fly to Europe. (9. April 1937)

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

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

The Duke and Duchess of York are crowned as King George VI and Queen Elizabeth of the United Kingdom of Great Britain and Northern Ireland at a ceremony in Westminster Abbey. (12. May 1937)

A German expedition led by Karl Wien loses sixteen members in an avalanche on Nanga Parbat. It is the worst single disaster to occur on an 8000m peak. (15. June 1937)

The world's first emergency telephone number, 999, is introduced in London (30. June 1937)

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

Pennsylvania becomes the first (and only) state of the United States to celebrate Flag Day officially as a state holiday. (14. June 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 New London School explosion killed 300 people, mostly children. (18. March 1937)

Tōngzhōu Incident: in Tōngzhōu, China, the East Hopei Army attacks Japanese troops and civilians. (29. July 1937)

Volkswagen (VW), the German automobile manufacturer was founded. (28. May 1937)

Second Sino-Japanese War: Battle of Lugou Bridge – Japanese forces invade Beijing, China. (7. July 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)

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