This map shows Southeastern Europe in 2022, essentially composed of the Balkan Peninsula, and the 12 countries and territories is contains.
As of 2022, about half the Balkan states are the result of the split of Yugoslavia, which occurred from 1991 to 2006. While the 6 republics that composed the Yugoslav Federation all acceded to sovereignty in that period, two are still subject to ethnic tensions: Bosnia-Herzagovina is composed of a Bosnian-Croat Federation and a Serb Republic, two entities that share very little. Serbia, the largest of the former republics, does not accept the secession of Kosovo, a former autonomous territory whose population is Albanian in its majority.
Other countries are Bulgaria, Romania, Greece, Albania and the European part of Turkey. All these were part of the Ottoman Empire and acceded to sovereignty in the nineteenth or early twentieth century.