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The start of the war is generally held to be September 1, 1939, with the German invasion of Poland and subsequent declarations of war on Germany by most of the countries in the British Empire and Commonwealth, and by France. Subsequently, the Soviet Union invaded Poland from the east side. Many countries were already at war before this date, such as Ethiopia and Italy in the Second Italo-Abyssinian War and Nationalist China and Japan in the Second Sino-Japanese War, and many who were not initially involved joined the war later, as a result of events such as the German invasion of the Soviet Union (Operation Barbarossa), and the attacks on Pearl Harbor and British colonies and subsequent declarations of war on Japan by Dutch and British Commonwealth.

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15y ago

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