WHAT ALL HAPPENED JULY TO AUGUST 1939
Find out what all happened July to August 1939

Albert Einstein and Leó Szilárd write a letter to Franklin D. Roosevelt, urging him to begin the Manhattan Project to develop a nuclear weapon. (2. August 1939)

13 Stukas dive into the ground during a disastrous air-practice at Neuhammer. There are no survivors. (15. August 1939)

The Wizard of Oz premieres at Grauman's Chinese Theater in Los Angeles, California. (15. August 1939)

First flight of the turbojet-powered Heinkel He 178, the world's first jet aircraft. (27. August 1939)

Lou Gehrig, recently diagnosed with Amyotrophic lateral sclerosis, informs a crowd at Yankee Stadium that he considered himself "The luckiest man on the face of the earth", then announces his retirement from major league baseball. (4. July 1939)

Holocaust: the last remaining Jewish enterprises in Germany are closed. (6. July 1939)

World War II: Germany and the Soviet Union sign a non-aggression treaty, the Molotov-Ribbentrop Pact. In a secret addition to the pact, the Baltic states, Finland, Romania, and Poland are divided between the two nations. (23. August 1939)

Nazi Germany mounts a staged attack on the Gleiwitz radio station, creating an excuse to attack Poland the following day thus starting World War II in Europe. (31. August 1939)

Huỳnh Phú Sổ founds Hòa Hảo Buddhism. (4. July 1939)

The United Kingdom and Poland form a military alliance in which the UK promises to defend Poland in case of invasion by a foreign power. (25. August 1939)