Treaty of San Stefano
This prompted the Great Powers to obtain a revision of this treaty. The subsequent Congress of Berlin a few months later was a meeting of the European Great Powers' which revised the Treaty of San Stefano. Although Greece and Serbia succeeded in becoming independent Kingdoms, autonomous from Turkey. Bulgaria's lost much of the territory it had gained, losing Thrace and Macedonia back to the Turks. These events all conspired to create tensions which would spill over into war. The issue of irredentism and nationalism gained great prominence after the creation of Greater Bulgaria and Turkish collapse following the 1878 Treaty of San Stefano. In the first half of the 20th century, control over Macedonia was a key point of contention between Bulgaria, Greece, and Serbia.