Germany got angered (including Adolf Hitler) seeing the drastic results of WWl. On top of losing, in WWl, Germany was forced to pay for war damages and limit their military. This weakened them, and some got angry or vowed to make Germany strong again. This started WWll and was likely the most important factor.
Germany (as we all know) lost WW1. They got totally recked by the treaty of Versailles. They had to demilitarize the Rine land. They could only have a military with 250,000 men AND they couldn't have an air force. And any European who was in Germany could pick any German they wanted to and start spanking them. Ok, I made that last one up, but that kinda explains how the Germans felt about the treaty. So, when a short, angry man with a silly mustache came in and said he could fix everything, the Germans believed him. But it wasn't what they thought it would be. Hitler blamed all of their problems on the Jews, and he kept saying how it was all of the Jew's fault for how they lost and stuff like that.
