quality:correction, stylistic:tone, structural:summarization
Union with Romania and the return of the Russians

The Treaty of Paris (1856) returned the southern part of Bessarabia (later organised as the Cahul, Bolgrad and Ismail counties) to Moldavia, which remained an autonomous principality and, in 1859, united with Wallachia to form Romania. In 1878, as a result of the Treaty of Berlin, Romania was forced to cede the three counties back to the Russian Empire.