How Realism explain the situation

  How does Realism explain the situation and what does Realism predict will happen? What would a Realist propose America should do? (Here you might want to briefly describe Realism). How does Liberalism shed light on the situation and what does Liberalism predict will happen? What would a Liberal propose for the United States to do? (Here you might want to briefly describe Liberalism not as a political agenda but as a theory of international justice).