Why Puerto Rico has its own team

How the insular territory made it to Athens: “Following the lopsided 92-73 defeat the Puerto Rican men’s basketball team handed the United States in Athens Sunday, many Americans were shocked. Not only did the U.S. team lose for only the third time in the history of its Olympic competition, it lost to a commonwealth of the United States. How can Puerto Rico, whose residents are U.S. citizens, field its own Olympic team?” — (Slate Explainer)