How did the work of Sigmund Freud affect the lives of ordinary people in the 20th century?

The work of Sigmund Freud affected the lives of ordinary people in the 20th century in that it encouraged people to search for the hidden reasons for their actions. Sigmund Freud (1856-1939) was a psychologist that used the psychoanalysis technique to understand the unconscious part of the human that influences its behavior.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.