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He wouldn't have made so many costly mistakes!
If he didn't attack the Soviet Union, i think Stalin would of backed hitler up or just turned a blind eye at everything, Hitler also made a mistake of making war against the USA after Japan decleared war on the US. Hitler had no reason to declear war against the US did he?. He should of just let Japan fight its own war. If hitler won the war he would of attacked Japan next anyways.
Once he took over poland hitler should of laid low for a few years. But he was bent on ruling europe.