What were the causes and consequences of world war 2?

Answer 1

Adolf Hitler reasons for domination of Europe was because he wanted to reverse the effects of the Treaty of Versailles which stripped Germany of 2 of its lands at the end of WWI and the reasons for Hitlers hate of Judaism was because he thought that Jewish workers were the reason of Germany's loss in WWI. After the war, Germany was split into Allied West Germany and Soviet East Germany which stayed like that til the 90s. It also marked the beginning of the Cold War and the start of the United Nations
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Answer 2

Literally thousands of books have been written and hundreds of films made to answer that very question. As there is no simple quick answer, see the reply to the question: "Why was the US a part of WWII?"

An argument can be made that the world is the way it is today because of WWII...