sentences:  After the whole region was incorporated once again into the Russian Empire in 1878, the process of Russification grew stronger, as many Bulgarian intellectuals returned to the newly established Principality of Bulgaria to help set up the Bulgarian state.The Russian Empire deprived the Bulgarian minority of the rights earned during Romanian control.The whole of Bessarabia was ceded to Romania in 1918 after the Russian Revolution and the collapse of the Russian Empire.