WW2 was caused by WW1 and the treaty they imposed.
And WW1 was a result of the Ranco-Prussiann war,which was revenge for the Napoleonic wars, which came about because of the English, French colonial wars which were the successors to the Spanish colonial wars which were a reaction the the muslims invading Spain and Byzantium and disrupting trade routes that had existed some Roman times.
So, you can blame it all on Muslims.