Today, only Serbia and (for now) Montenegro are what remain of the republics that once constituted Yugoslavia. The former Kingdom of the Serbs, Croats, and Slovenes, named Yugoslavia in 1929, has been a flashpoint of violence, terror, ethnic strife, and failed politics-and a mirror on the conflicts of the 20th century. From the first Serbian uprising against the Turks in 1804 to the coming trial and likely fate of Slobodan Milosevic, Leslie Benson...