Reasons of first world war:
Once ferdinand went to Serbia for a conference meeting while returning he was killed by Princip becaus eof family problems.This led to the outcome of World War1
Reasons of World War 2:
Hitler tried to invade Danzing port which is Poland.Then the Poland people took support of other countries and fought with Germany.This led to the outcome of World war2
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Reason for 2 world war is: Treaty of versailes when poland refused the demand of hitler he made a lightning war on germany.and Also entry of british to india First world war The immediate cause is the congress of berlin gave the right to austria. And austria annexed bonsia and herzigovina against congress of berlin. It created rivalry between austri hungary and serbia