WHAT ALL HAPPENED APRIL TO SEPTEMBER 1940
Find out what all happened April to September 1940

World War II: Vichy France regime is formally established. Philippe Pétain becomes Prime Minister of France. (11. July 1940)

Vidkun Quisling seizes power in Norway. (9. April 1940)

The first successful west-to-east navigation of Northwest Passage begins at Vancouver, British Columbia, Canada. (21. June 1940)

USS Sailfish is recommissioned. It was originally the USS Squalus. (15. May 1940)

World War II: Norway surrenders to German forces. (10. June 1940)

The United States' Under Secretary of State Sumner Welles issues a declaration on the U.S. non-recognition policy of the Soviet annexation and incorporation of three Baltic states: Estonia, Latvia and Lithuania. (23. July 1940)

Pennsylvania Central Airlines Trip 19 crashes near Lovettsville, Virginia. The CAB investigation of the accident is the first investigation to be conducted under the Bureau of Air Commerce act of 1938. (31. August 1940)

The Second Vienna Award re-assigns the territory of Northern Transylvania from Romania to Hungary. (30. August 1940)

The British liner SS City of Benares is sunk by German submarine U-48; those killed include 77 child refugees. (18. September 1940)

World War II: Battle of Dunkirk – In France, Allied forces begin a massive evacuation from Dunkirk, France. (26. May 1940)

Appeal of June 18 by Charles de Gaulle. (18. June 1940)

California opens its first freeway, the Arroyo Seco Parkway. (20. July 1940)

World War II: The German 2nd Panzer Division captures the port of Boulogne-sur-Mer; the surrender of the last French and British troops marks the end of the Battle of Boulogne (25. May 1940)

World War II: France officially surrenders to Germany at 01:35. (25. June 1940)

King Carol II of Romania abdicates and is succeeded by his son Michael. (6. September 1940)

World War II: Norwegian Campaign – Norwegian squads in Hegra Fortress and Vinjesvingen capitulate to German forces after all other Norwegian forces in southern Norway had laid down their arms. (5. May 1940)

The three Baltic states of Estonia, Latvia and Lithuania fall under the occupation of the Soviet Union. (17. June 1940)

World War II: The Soviet Union formally annexes Latvia. (5. August 1940)

World War II: sinking of the RMS Lancastria by the Luftwaffe near Saint-Nazaire, France. At least 3,000 are killed; Britain's worst maritime disaster. (17. June 1940)

World War II: The Siege of Calais ends with the surrender of the British and French garrison. (26. May 1940)