The ethnic Romanians, who formed the majority population of Transylvania, elected representatives who proclaimed the Union with Romania on 1 December 1918. The Proclamation of Union at Alba Iulia was adopted by the Deputies of the Romanians from Transylvania, supported one month later by the vote of the Deputies of the Transylvanian Saxons. By Spring 1919, during the Hungarian–Romanian War, Transylvania came under administrative control of Romania. Eventually in June 1920 the Treaty of Trianon assigned Transylvania to the Kingdom of Romania.