The Megali Idea dominated foreign policy and domestic politics of Greece from the War of Independence in the 1820s through the Balkan wars in the beginning of the 20th century. It started to fade after the Greco-Turkish War (1919–1922) and the Great Fire of Smyrna in 1922, followed by the population exchange between Greece and Turkey in 1923. Despite the end of the Megali Idea project in 1922, by then the Greek state had expanded four times, either through military conquest or diplomacy (often with British support). After the creation of Greece in 1830, it annexed the Ionian Islands (Treaty of London, 1864), Thessaly (Convention of Constantinople (1881)), Macedonia, Crete, (southern) Epirus and the Eastern Aegean Islands (Treaty of Bucharest), and Western Thrace (Treaty of Neuilly, 1920). The Dodecanese were annexed after the Second World War (Treaty of Peace with Italy, 1947).