Romania initially remained neutral in World War I but joined the (Allies) in 1916 after being promised Transylvania and other territories.
: On December 30, 1947 , King Michael was forced to abdicate at gunpoint. The People's Republic of Romania was proclaimed, ending 81 years of Hohenzollern rule and marking the beginning of four decades of Communist rule. România, 1866–1947
Under King Carol I, Romania entered a period of relative stability and rapid economic development focused on infrastructure, such as the national railway system. Romania initially remained neutral in World War I