The "Great Union" refers to the unification of the regions of Transylvania, Bessarabia, and Bukovina with the Kingdom of Romania in 1918. This event marked a significant moment in Romanian history, as it brought together various territories inhabited by Romanian-speaking populations, enhancing national identity and territorial integrity. The Great Union is celebrated annually on December 1st, known as Romanian National Day. This day commemorates the assembly of representatives from these regions in Alba Iulia, where they declared their union with Romania. The event symbolizes unity and the aspiration for a cohesive Romanian state.