A cikin juyin mulkin 1866, an kori Cuza kuma an maye gurbinsa da Yarima Karl na Hohenzollern-Sigmaringen.An nada shi Domnitor, Yarima mai mulki na United Principality na Romania, a matsayin Yarima Carol na Romania.Romania ta shelanta 'yancin kai daga Daular Usmaniyya bayan yakin Rasha da Turkiyya (1877-1878) , inda Daular Usmaniyya ta yaki daular Rasha .A cikin 1878 Yarjejeniyar Berlin, Ƙasashen Duniya sun amince da Romania a matsayin ƙasa mai cin gashin kanta.^[76] <> A sakamakon haka, Romania ta ba da gundumar Bessarabia ga Rasha don samun damar shiga tashar jiragen ruwa na Bahar Maliya kuma ta sami Dobruja.A cikin 1881, matsayin sarautar Romania ya kasance na masarauta kuma a ranar 26 ga Maris na wannan shekarar, Yarima Carol ya zama Sarki Carol I na Romania.