The Communist Manifesto and Karl Marx and Frederick Engels In The Communist Manifesto, Karl Marx and Frederick Engels present their view of human nature and the effect that the economic system and economic factors have on it. Marx and Engels discuss human nature in the context of the economic factors which they see as driving history. Freud, in Civilization and Its Discontents, explores human nature through his psychological view of the human mind. Marx states that history "...is the history of class struggles" (9). Marx views history as being determined by economics, wh