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World war 2nd started with the declaration of war by nazi germany against poland on september 1st 1939.
what a brain yaar
excuse me why u said like tht??
Second world war was started in september1st 1939.the main reason is on the 1st sep 1939 many Nazi's miltary troops invaded the Poland.and if Poland was attacked UK and France promised that they would help the poles so they demanded hitler by menancing if hitlers troops wont surrender by 3rd of the september. hitler ignored this so there was a war.this water continued till the 2nd september of 1945.

hope this helps.pls mrk as brainliest.
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