What new ideas did Sigmund Freud introduce regarding why humans do things? How did those ideas impact the art and literature of the time?

Question

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here are the main topics nativism , Harlem renaissance , Sacco and Vanzetti , racial perspective ,ethnic perspective, red scare , and the 1920’s

Answer 1

Sigmund Freud, the father of psychoanalysis,who lived from 1856 to 1939 was an Austrian physician and neurologist who influenced literature and art, especially those critics that popularized such popular expressions as "uncanny," "the unconscious" "or Freudian slip" and dominated the Zeitgeist of 19th and 20th century, known as Modernism.