Yugoslav Wars
The decade of wars that tore Yugoslavia apart, brought genocide back to Europe, and defined what the post-Cold War West would and would not stop.
Between 1991 and 2001 the country called Yugoslavia stopped existing, and roughly 140,000 people died in the process. The wars produced the first genocide on European soil since 1945, put four million people to flight, gave the world the phrase "ethnic cleansing," and forced a triumphant post-Cold War West to decide, repeatedly and late, whether atrocity in a small country was any of its business. Nearly every argument about humanitarian intervention since, from Iraq to Libya to Syria, is an argument about lessons drawn from the Balkans.
Why it fell apart
Yugoslavia was six republics, two autonomous provinces, and a deliberate balance of nations held together by a communist party, a shared war myth, and Josip Broz Tito. Tito died in 1980 and left a rotating collective presidency, which is a machine for producing deadlock. Then the economy collapsed: foreign debt, IMF austerity, and inflation that hit four figures. Republics blamed each other for the bill.
Into that vacuum stepped Slobodan Milosevic, a Serbian party functionary who discovered in 1987 that nationalism was the one currency not being devalued. He stripped Kosovo and Vojvodina of their autonomy in 1989, seized control of federal institutions, and convinced Serbs they were victims. Croatia's Franjo Tudjman ran the same play in the other direction. Both understood that if Yugoslavia died, the borders of the republics would not match the map of who lived where. About two million Serbs lived outside Serbia.
Four wars
Slovenia declared independence in June 1991 and got out after a ten-day skirmish, because almost no Serbs lived there. Croatia did not: the war for the Serb-held Krajina ground on for four years, flattening Vukovar and shelling Dubrovnik.
Bosnia was the catastrophe. It had no ethnic majority at all: Bosniak Muslims, Serbs, and Croats lived interleaved in the same towns and often the same families. When it voted for independence in early 1992, Bosnian Serb forces backed by the Yugoslav army seized about 70 percent of the territory within months and set about making it homogeneous. Sarajevo was besieged for nearly four years, the longest siege of a capital in modern warfare. Camps at Omarska and Trnopolje appeared on Western television. Roughly 100,000 people died.
The nadir was Srebrenica. In July 1995, Bosnian Serb forces under Ratko Mladic overran a town the United Nations had declared a "safe area," walked past the lightly armed Dutch battalion guarding it, separated the men and boys from their families, and murdered around 8,000 of them. Both the ICTY and the International Court of Justice ruled it genocide.
That was the turn. NATO bombing and a Croatian ground offensive finally broke the Bosnian Serb position, and in November 1995 the parties were locked in an air base in Dayton, Ohio until they signed. The Dayton Agreement stopped the killing by freezing the ethnic map into a constitution: two entities, three presidents, and a foreign High Representative on top. Bosnia still runs on it.
Kosovo came last. As Serbian forces moved against the Kosovo Liberation Army and the Albanian population in 1998 and 1999, NATO went to war for 78 days without a UN Security Council resolution, on the argument that legality and legitimacy had come apart. Milosevic pulled out. Kosovo declared independence in 2008 and Serbia still does not recognize it.
What it left
The ICTY in The Hague indicted 161 people and established that heads of state could be put in the dock: Milosevic died in his cell in 2006 before a verdict; Radovan Karadzic and Mladic were convicted of genocide and are serving life. The tribunal became the template for the International Criminal Court.
The deeper legacy is a doctrine and a doubt. Srebrenica and Rwanda together produced the Responsibility to Protect, adopted by the UN in 2005, and the conviction in Western capitals that airpower could stop atrocities cheaply. Kosovo also set the precedent Vladimir Putin has cited ever since to justify Crimea: that great powers redraw borders in the name of protecting a minority, and only argue afterward about who is allowed to do it.