I can answer number 7, the aryans were the “race” of people who inhabited Europe. Hitler described them as the perfect race when having blonde hair and blue eyes.
After World War 1, prevalent attitudes in America included one of not supporting the US being involved in foreign affairs. World War 1 started in 194 and ended in 1918. After the First World War, isolationism became prevalent in American society. Another attitude that developed was nativism.
here's the website: www.answers.com/Q/What_attitudes_became_prevalent_in_America_after_World_War_