The Greco-Turkish War (1919–1922) was a conflict between the Kingdom of Greece and the Turkish National Movement following World War I. It began when Greek forces landed in western Anatolia, aiming to expand Greek territory and influence in the region. The war was marked by significant battles and shifting front lines, as both sides sought control over areas with mixed populations. The conflict ended with the Treaty of Lausanne in 1923, which established the boundaries of modern Turkey and led to a population exchange between Greece and Turkey. This war significantly shaped the national identities and territorial claims of both nations.