September 1, 1939 was the official beginning of World War 2.
September 1, 1939
The date has been fixed at September 1st 1939, the day that Germany invaded Poland.
September 1939 is the month the historians use as the beginning of World War 2.
Germany invaded Poland on September 1, 1939. This event marked the de-facto beginning of World War II.
1 September 1939. After Germany invaded Poland. France and the United Kingdom thereby declared war on Germany, signalling the beginning of the Second World War.
France
1939
FDR
Neutral
by radio
the Jews