Answer: After WWI ended, Hitler turned to the Jews as a scapegoat to blame the lost on.
Explanation: Hitler also began using methods such as indoctrination to teach that there was an inferior race and noninferior race who were minorities such as the Jews and those with disabilities. Jews began to be targeted through events such as Kristallnacht/The Night of Broken Glass. Jews were then segregated into ghettos where there was a lack of food, diseases, etc. so they can slowly kill off Jews. When Hitler decided Jews were not dying fast enough, he turned to the Final Solution which was the mass murder of Jews.
The African Americans helped out the war majorly throughout that time period. They participated in protest marches and also tried to join the forces with blacks to fight for freedom.