So how did hitler get into power in Germany?

Hitler became Führer: when Hindenburg died, Hitler declared himself jointly president, chancellor and head of the army. Members of the armed forces had to swear a personal oath of allegiance not to Germany, but to Hitler. This formally made Hitler the absolute ruler of Germany.

Explanation:

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kept climbing up the ranks until he got to the point where he could have an entire Army and he started invading countries and people let him do it