The NAZI's believed that the Aryans, not just the white people but specifically the Germanic white people, were superior and should run the world. They decided to start with Europe. The outcome of WW1 followed by the world wide financial depression of the 1930's left Germany in bad financial condition. The NAZI's were able to gain popularity by blaming much of their financial troubles on Jews. Instead of accepting that their financial dificulty was the result of GLOBAL financial depression coupled with sanctions following WW1, they chose to blame all of their problems on others. The simple truth is, Hitler manipulated the German public, promising prosperity when they conquered Europe and claimed all of the resourcs of the continent.