How did the ideas of Nietzsche and Freud influence post-World War 1 ideas?

Nietzsche's ideas of individualism and existentialism influenced post-World War 1 philosophical thinking, challenging traditional beliefs and values. Freud's psychoanalytic theories, such as the unconscious mind and the importance of childhood experiences, influenced psychology and the understanding of human behavior and motivations in the post-war era. Both thinkers contributed to a broader questioning of authority and traditional norms, leading to new perspectives on the human experience.