<P> The start of the war in Europe is generally held to be 1 September 1939 , beginning with the German invasion of Poland ; the United Kingdom and France declared war on Germany two days later . The dates for the beginning of war in the Pacific include the start of the Second Sino - Japanese War on 7 July 1937 , or even the Japanese invasion of Manchuria on 19 September 1931 . </P>
<P> The start of the war in Europe is generally held to be 1 September 1939 , beginning with the German invasion of Poland ; the United Kingdom and France declared war on Germany two days later . The dates for the beginning of war in the Pacific include the start of the Second Sino - Japanese War on 7 July 1937 , or even the Japanese invasion of Manchuria on 19 September 1931 . </P>
the reason for the start of world war 2
the reason for the start of world war 2
the German invasion of Poland
the German invasion of Poland