In eight months, Russian troops occupied all of Bulgaria and reached Constantinople. At this high point of its influence on Balkan affairs, Russia dictated the Treaty of San Stefano in March 1878. This treaty provided for an autonomous Bulgarian state (under Russian protection) almost as extensive as the First Bulgarian Empire, bordering the Black and Aegean seas. But Britain and Austria-Hungary, believing that the new state would extend Russian influence too far into the Balkans, exerted strong diplomatic pressure that reshaped the Treaty of San Stefano four months later into the Treaty of Berlin. The new Bulgaria would be about onethird the size of that prescribed by the Treaty of San Stefano; Macedonia and Thrace, south of the Balkans, would revert to complete Ottoman control. The province of Eastern Rumelia would remain under Turkish rule, but with a Christian governor.

Whereas the Treaty of San Stefano called for two years of Russian occupation of Bulgaria, the Treaty of Berlin reduced the time to nine months. Both treaties provided for an assembly of Bulgarian notables to write a constitution for their new country. The assembly would also elect a prince who was not a member of a major European ruling house and who would recognize the authority of the Ottoman sultan. In cases of civil disruption, the sultan retained the right to intervene with armed force.

The final provisions for Bulgarian liberation fell far short of the goals of the national liberation movement. Large populations of Bulgarians remained outside the new nation in Macedonia, Eastern Rumelia, and Thrace, causing resentment that endured well into the next century. (Bulgarians still celebrate the signing of the Treaty of San Stefano rather than the Treaty of Berlin as their national independence day.) In late 1878, a provisional Bulgarian government and armed uprisings had already surfaced in the Kresna and Razlog regions of Macedonia. These uprisings were quelled swiftly by the Turks with British support. During the next twenty-five years, large numbers of Bulgarians fled Macedonia into the new Bulgaria, and secret liberation societies appeared in Macedonia and Thrace. One such group, the Internal Macedonian Revolutionary Organization (IMRO), continued terrorist activities in the Balkans into the 1930s.

Data as of June 1992