It depends entirely on who you ask. There was fighting in the Pacific theater long before there was any fighting in Europe. But over in Europe, it was Hitler breaking the Treaty of Versailles in almost every way.
Germany invaded Poland
the invasion of poland 1st september 1939
The War started when Adolf Hitler's Nazis Germany invaded Poland.
It started with the attack on Pearl Harbor in Hawaii
Hitler invaded Poland.
The event that brought the USA into WW II was the bombing of Pearl Harbor on Dec. 7th, 1941.
Germany started world war 2 when they invaded poland
In world war 1,germany started the war,but in world war 2,japan started it and usa ended the war
world war 1 started July 28th 1914 and world war 2 started 3rd September 1939
The bombing of Pearl Harbor was the main thing that started the war
The German Invasion of Poland started World War 2.
Which event at the conclusion of World War 2 initiated the Cold War?Read more: Which_event_at_the_conclusion_of_World_War_2_initiated_the_Cold_War