WHAT ALL HAPPENED JUNE TO SEPTEMBER 1939
Find out what all happened June to September 1939

First flight of the German Focke-Wulf Fw 190 fighter-bomber airplane. (1. June 1939)

World War II: Nazi Germany and Slovakia invade Poland, beginning the European phase of World War II. (1. September 1939)

World War II: The United Kingdom and France begin a naval blockade of Germany that lasts until the end of the war. This also marks the beginning of the Battle of the Atlantic. (3. September 1939)

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

The Nazi propaganda broadcaster known as Lord Haw-Haw begins transmitting. (18. September 1939)

General Władysław Sikorski becomes commander-in-chief of the Polish Government in exile. (30. September 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)

Last public guillotining in France: Eugen Weidmann, a convicted murderer, is guillotined in Versailles outside the Saint-Pierre prison (17. June 1939)

World War II: Polish government of Ignacy Mościcki flees to Romania. (18. September 1939)

NBC broadcasts the first televised American football game between the Waynesburg Yellow Jackets and the Fordham Rams. Fordham won the game 34-7. (30. September 1939)

Holocaust: The MS St. Louis, a ship carrying 963 Jewish refugees, is denied permission to land in Florida, in the United States, after already being turned away from Cuba. Forced to return to Europe, more than 200 of its passengers later die in Nazi concentration camps. (4. June 1939)

The Baseball Hall of Fame opens in Cooperstown, New York. (12. June 1939)

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

Romanian Prime Minister Armand Călinescu is assassinated by far-right legionnaires of the fascist paramilitary organization called the Iron Guard. (21. September 1939)

Siam is renamed Thailand by Plaek Pibulsonggram, the country's third prime minister. (24. June 1939)

World War II: Canada declares war on Nazi Germany, joining the Allies – France, the United Kingdom, New Zealand and Australia. (10. September 1939)

Adolf Hitler signs an order to begin the systematic euthanasia of mentally ill and disabled people. (1. September 1939)

Taisto Mäki becomes the first man to run the 10,000 metres in under 30 minutes, in a time of 29:52.6 (17. September 1939)

Shooting begins on Paramount Pictures' Dr. Cyclops, the first horror film photographed in three-strip Technicolor. (12. June 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)