Transylvania backed by the mobilization of Romanian troops, proclaimed Union with Romania on 1 December 1918. The "Proclamation of Union" of Alba Iulia was adopted by the Deputies of the Romanians from Transylvania, and supported one month later by the vote of the Deputies of the Saxons from Transylvania. The national holiday of Romania, the Great Union Day (also called "Unification Day") occurring on December 1, celebrates this event. The holiday was established after the Romanian Revolution, and marks the unification not only of Transylvania, but also of the provinces of Banat, Bessarabia and Bukovina with the Romanian Kingdom. These other
Transylvania to Transylvania, and 280,000 from Transylvania to the Old Kingdom, most notably to Bucharest). According to the results of the 2011 Population Census, the total population of Transylvania was 6,789,250 inhabitants and the ethnic groups were: Romanians - 70.62%, Hungarians - 17.92%, Roma - 3.99%, Ukrainians - 0.63%, Germans - 0.49%, other - 0.77%. Some 378,298 inhabitants (5.58%) have not declared their ethnicity. The presented data are from http://www.recensamantromania.ro/rezultate-2, the Table no. 7. The ethnic Hungarian population of Transylvania form a majority in the counties of Covasna (73.6%) and Harghita (84.8%). The Hungarians are also numerous in the following counties: