Racism: Racism is the belief that one race is superior to another. The Nazis believed that the Aryan race was superior to other races, and they used this belief to justify the extermination of Jews and other "undesirable" populations.
Nationalism: Nationalism is a sense of pride in and loyalty to one's country. The Nazis used nationalism to unite the German people and to create a sense of superiority over other nations.
Economic Crisis: The Great Depression of the 1930s caused widespread economic hardship in Germany. The Nazis blamed Jews for the economic crisis, and this further increased anti-Semitism in Germany.
Militarism: Militarism is the belief in the importance of military power. The Nazis believed that Germany needed a strong military in order to protect itself and to expand its territory. They used the military to wage war on other countries and to carry out the Holocaust.
Propaganda: The Nazis used propaganda to spread their ideology and to dehumanize Jews and other "undesirable" populations. Propaganda was used to convince the German people that Jews were a threat to Germany and that the Holocaust was necessary.