Why is sigmund freuds work important?

Whether or not Sigmund Freud was actually important to history is debatable. However, his theory of psychoanalysis to interpret the psyche and explain inner drives and behaviors can be applied to history. One example occurs in "Thomas Woodrow Wilson: A Psychological Study," where Wilson's deficiencies as president, notably his need to fail, are attributed to his inability as a boy to satisfy the demands of an insatiable father. He also published several books about historical events and the dawn of man, check out Totem & Taboo, Civilization & its Descendents, and Moses & Monotheism to look at these theories.