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In page City-state:

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Some proposals for the partition of the Ottoman Empire envisaged international zones at Istanbul/Constantinople or the wider Turkish straits,[1] and possibly also at İzmir/Smyrna.[2] Although the allies of World War I occupied both after the 1918 Armistice of Mudros, the British-led occupation of Istanbul recognised Turkey as de jure sovereign, while the Greek occupation of Smyrna was an attempted annexation. The 1923 Treaty of Lausanne re-established Turkish control of both areas.[citation needed]