Which country became the immediate successor to the Ottoman Empire after World War I?

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The country that became the immediate successor to the Ottoman Empire following World War I is Turkey.1

Following the empire's defeat and the subsequent Turkish War of Independence, the Treaty of Lausanne, signed on July 24, 1923, formally recognized the modern state of Turkey as the successor to the Ottoman Empire. Shortly thereafter, on October 29, 1923, the Turkish assembly officially declared the nation a republic and elected Mustafa Kemal as its first president.12