These were the lack of productivity of its war economy the weak supply lines the start of a war on two fronts and the lack of strong leadership. Following the invasion of the Soviet Union using the Blitzkrieg tactic, the German Army marched far into Russia.
Hitler killed himself by giving him and his wife cyanide and shot himself with a revolver. his body was later dragged out and burned. But they only burnt the front so that the Russians could not recognize him. But they had an idea to find his dentist to see if they are his teeth but they didn't find his dentist but they found the assistant and she was able to recognize his teeth and they found out it was him.