Part of the cause would be the great depression which might have helped bring him into power in the first place. Not only that but Hitler promised to restore Germany to its former glory. Remember after WWI Britain and the Allies put all the blame lf the war on Germany and forced it to pay reparations. When the Great Depression came after WWI it impacted many countries but was the hardest on Germany who was already in debt from the war. Hitlers one of the first things to do was stop paying reparations and use that money to invest back into Germany. His effect was making Germany more powerful like building up the military and getting it ready for WWII and invading Poland and breaking several agreements with USSR. He also affected 11 million people who were part of the Final Solution and his plan to racial cleanse the world killing Jews, gays, disabled ect. He brought unity to Germany but also beought great destruction to everyone else.
