On the one side, the Mexican side, Mexican peasants are tantalized by the American possibility of change. On the other side, the American side, the tyranny of American optimism has driven Americans to neurosis and depression, when the dream is elusive or less meaningful than the myth promised. This constitutes the great irony of the Mexican-American border: American sadness has transformed the drug lords of Mexico into billionaires, even as the peasants of Mexico scramble through the darkness to find the American dream.