This holiday was set after the 1989 Romanian Revolution and it marks the 1918 unification of the Romanian Kingdom with Transylvania.
The first holiday of Romania was set to be on May 10, which had a double meaning: it was the day in which it was instaurated the Romanian monarchy (in 1866), it was the day in which it was signed the Declaration of independence (in 1877).
The communist regime changed the national holiday was on August 23 (1944 - the overthrow of the fascist government).National holiday history