The U.S. is obliged to go to war for 67 countries, including Cuba

Thanks to a complicated mesh of treaties and other deals put in place since the end of World War II, the United States is (theoretically) obligated to defend 67 nations -- comprising about a quarter of the world's population -- in the event of war. This data comes from Tufts University political scientist Michael Beckley, who recently published a study entitled "The Myth of Entangling Alliances." Some of the countries on the list are obvious (Israel and France, for example), while others, like C...