Yugoslavia is gone, forever. The country that emerged from World War I and Versailles as the Kingdom of the Serbs, Croats and Slovenes, land of the South Slavs, has passed into history. Sunday's vote in Montenegro, a tiny land of fewer people than the Washington, D.C., this writer grew up in, voted Sunday to secede from Belgrade, establish a nation and seek entry into the European Union. In 1991, Macedonia peacefully seceded. Slovenia and Croatia fought their way out, and Bosnia broke free after a war marked by the massacre at Srbenica and NATO intervention. Bosnia is itself subdivided into...