What were most important developments during world war 2

Sept. 1, 1939:
Germany invades Poland, marking what many regard as the start of the war, though Japan invaded China on July 7, 1937. Two days later, France and the United Kingdom declare war on Germany. April 9 to June 22, 1940:
Germany takes control of much of Western Europe, including France.

Yes i believe he was involved, but the main culprit was bill clinton