Final answer:
The Greco-Turkish War resulted in the forced displacement of around two million people due to the Treaty of Lausanne and contributed to the collapse of the Ottoman Empire, leading to the foundation of modern Turkey.
Step-by-step explanation:
Outcome of the Greco-Turkish War
A significant result of the Greco-Turkish War was the forced displacement of populations due to religious and ethnic differences. Following the Treaty of Lausanne in 1923, a population exchange occurred between Greece and Turkey, which involved around two million people being forced to move because of their Christian or Muslim beliefs. This event marked the dissolution of multi-ethnic territories in accordance with the rise of nationalism. As for the Ottoman Empire, the war led to its eventual collapse and the establishment of the Turkish Republic under Mustafa Kemal Atatürk, who had emerged as a national hero during the earlier defense of Gallipoli against the Allied invasion in World War I.
Meanwhile, the genocide against the Armenians by the Ottoman Empire during this period also stands out as one of the war's most horrific outcomes. The Armenian population had been subjected to systematic massacres and death marches which resulted in the death of nearly one million Armenians. These atrocities were part of the wider implications of the war and the empire's decline, leading to a significant redrawing of the map of the Middle East and the Balkans with the end of Ottoman rule.