The Federal Republic of Romania (Romanian: Republica Federală România, RFR), colloquially known as Romania (România), is a nation state located in Eastern Europe. The modern day nation began in the 1850s from the unification of two Romanian principalities. Romania's borders expanded following World War I to include territories once belonging to the Austro-Hungarian Empire (Transylvania) and the Russian Empire (Bessarabia). The nation came under Soviet domination throughout the Cold War, divided between the Socialist Republic of Romania and the Moldavian Soviet Socialist Republic.