The modern nation that was originally part of the Ottoman Empire during World War I is Turkey. Following the collapse of the Empire after the war, Turkey emerged as a sovereign state. The transition was marked by the Turkish War of Independence, led by Mustafa Kemal Atatürk, who sought to establish a secular and nationalistic government. In 1923, the Treaty of Lausanne recognized Turkey's borders, shaping its modern identity. The legacy of the Ottoman Empire remains evident in Turkey's cultural, religious, and socio-political landscape, influencing its role in regional and global affairs.