If I lived in a region conquered by the Mongols it would have affected me by having new rulers. I'm pretty sure the living conditions have gotten worse. I think the overall impact is negative
The concept of 'living space' that was one of Hitler's greatest goals. The idea was for Germany to expand to the West and East and take back land that they had lost after World War I. This living space would be required for Aryan Germans.
Hitler wrote in Mein Kampf of his hatred towards what he believed were the world's twin evils, namely communism and Judaism. He said his aim was to eradicate both from Germany and moreover stressed his intention to unite all Germans in the process of destroying them.