"Even the peace that followed the Balkan Wars was cruel, in a novel manner that would become a recurrent feature of the twentieth century. It no longer sufficed, in the eyes of nationalists, to acquire foreign territory. Now it was peoples as well as borders that had to move. Sometimes these movements were spontaneous. Muslims fled in the direction of Salonika as the Greeks, Serbs and Bulgarians advanced in 1912; Bulgarians fled Macedonia to escape from invading Greek troops in 1913; Greeks chose to leave the Macedonian districts ceded to Bulgaria and Serbia by the Treaty of Bucharest. Sometimes populations were deliberately expelled, as the Greeks were from Western Thrace in 1913 and from parts of Eastern Thrace and Anatolia in 1914. In the wake of the Turkish defeat, there was an agreed population exchange: 48,570 Turks moved one way and 46,764 Bulgarians the other across the new Turkish-Bulgarian border. Such exchanges were designed to transform regions of ethnically mixed settlement into the homogeneous societies that so appealed to the nationalist imagination. The effects on some regions were dramatic. Between 1912 and 1915, the Greek population of (Greek) Macedonia increased by around a third; the Muslim and Bulgarian population declined by 26 and 13 per cent respectively. The Greek population of Western Thrace fell by 80 per cent; the Muslim population of Eastern Thrace rose by a third. The implications were distinctly ominous for the many multi-ethnic communities elsewhere in Europe."