It started on Sunday the 3rd of September, 1939.
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September 1 1939.
It marked the start of the overthrow of Third Reich.
"D" in d-day stands for . . . 'day', and it refers to the day on which a major war attack will start. If it is capitalized, like "D-Day", then it refers to the Allies 1944 invasion of Europe in World War II.
December 7, 1941, the same day that WW2 in the Pacific started in the US.
The USA became legally and officially involved in World War 2 when the Japanese Forces bombed Pearl Harbor, Hawaii on 12-7-1941. The next day the Congress and President Roosevelt declared war on Japan for the unprovoked attack by Japan upon the USA. A week later Adolf Hitler, leader of the Nazi Germans, declared war on the USA thus putting the US in the European War officially.