Hitler and his supporters, the Nazi party, took power in Germany in 1933. They were Social Darwinists, Social Darwinists believe that human races are stronger or weaker than each other. They believed that the stronger races would prove themselves better in the long run, this concept was called "survival of the fittest". Nazis believed that their race the Aryans were stronger than all the other races, because of this, they believed the Aryans would one day rule over the weaker races. The Nazis made laws that were based on their ideas of race. They prevented marriage between races so that the Aryan race would not become mixed with other "weaker" races because they believed it would weaken the master race. They claimed that "Aryans" were the "master race". They also made propaganda that blamed Jews for many things. Jews were considered by Nazis, a weak race whose weak values would infect the better values of the Aryan race. German Jews were not allowed to own property. In many cases, they were attacked and killed because of their Race. When Germany invaded other countries in Europe, they also started putting people into concentration camps. This systematic killing is known as The Holocaust today.