What is the theme in Drown by Junot Diaz?

One major theme in the novel, Drown, is the American Dream. The dream Yunior's father follows as he moves his family from Santo Domingo to the United States... a place he believes will afford his family a nice home.... a place that he can have his own business. Unfortunately, a huge portion of that dream is shattered when he leaves his wife and family for another woman.