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Treaty of Lausanne

peace treaty between the Republic of Turkey and the Allied Powers at the end of World War 1, replacing the Treaty of Sèvres
The Treaty of Lausanne changed the borders of Bulgaria, Greece, and Turkey.
The red lines show Turkey's new borders.
Because of the treaty of Lausanne, Turkey was not responsible for what is called Armenian Genocide today. This is a carricature from a newspoper, from 1924.

The Treaty of Lausanne was signed in 1923, after Turkey had won the Greco-Turkish War, of 1919-22. It settles the border between modern-day Greece, and modern-day Turkey, as well as other borders of Turkey. Other countries that signed the treaty include Italy, France, Great Britain, Japan, as well as the Kingdom of Yugoslavia.

Note that Greece and Turkey have had disputes, often focused on the question, which country certain (usually uninhabited) islands and rocks in the Aegean Sea belong to. In 1987, and 1996 these disputes almost led to military conflict.