The American Dream is the myth or ideology that people can raise themselves to great heights through their own efforts. In other words, the dream is predicated on the idea that America is a meritocracy, in which hard work and virtue are rewarded.
Gatsby introduces Nick to a gangster named Meyer Wolfsheim, and Gatsby tells Nick that Wolfsheim arranged the fixing of the World Series in 1919. In this scandal, members of the Chicago White Sox team were bribed to lose the World Series. In The Great Gatsby, the throwing of the World Series represents the corruption of the society of the 1920s. Gatsby wants to pursue the American Dream, but Gatsby's pursuit of the dream does not wind up as he had hoped, as he meets an early death and never wins the love of his life, Daisy. The corruption that tainted the 1919 World Series is emblematic of the way in which the American Dream diverges from reality.