Dr. Robert Kagan spoke on how the liberal world order established by the United States after World War II is collapsing. This long period of prosperity, widespread democracy, and great power peace was an historical anomaly. The dramatic change of course after 1945 was not due to some sudden triumph of our better angels or embrace of Enlightenment principles. Instead, liberal ideals triumphed because, for the first time, they had power behind them. Read more here.