What is one thing that hitler or the germans did that was an important cause of germany's defeat?

Hitler made a major mistake by making all military decisions by himself, without taking advice. His decision to invade the Soviet Union was a complete failure because Germany was not prepared and they had misjudged the Soviet Union’s defensive power. 

if a bill passes in the house of representatives, it goes through a similar process in the senate. before a bill becomes law, it must be approved by both chambers of the legislature. the bill must pass with the same wording in the house of representatives and the senate before it can go to the governor for approval.

they believed democracy was worth the fight