Hungary directly and forcefully subjugates Transylvania starting a process of Magyarization.
The Romanian Parliament declares the independence of Romania from the Ottoman Empire.
King Carol dies and his nephew, Ferdinand takes his place. After two years of neutrality, Romania joins the war on the Allies’ side, against the Axis (Austria-Hungary and Germany especially) seeking to recover the lost territories.
After the War, Romania takes back Transylvania, Basarabia and part of Bucovina, unifies and forms Great Romania. Since then, December, 1st 1918, the day of the Great Union, is the National Day of Romania.