Great Union Day is a public holiday in Romania observed on 1 December. It commemorates the unification of Transylvania, Bessarabia, and Bukovina with the Romanian Kingdom in 1918.

Romanian troops (Regiment 16 Dorobanți "Fălticeni") marching in Cluj, Transylvania, 1918. Photographer: Merl LaVoy. Wikipedia / CC BY 2.0
Romania: Great Union Day

Romanian troops (Regiment 16 Dorobanți "Fălticeni") marching in Cluj, Transylvania, 1918. Photographer: Merl LaVoy. Wikipedia / CC BY 2.0