In May 1913, following the Second Balkan War and after unsuccessful Bulgarian-Romanian negotiations in London, the two countries accepted the mediation of the Great Powers, who awarded Silistra and the area in a 3 km radius around it to Romania at the Saint Petersburg Conference. The 1913 Treaty of Bucharest ceded Silistra and the whole of Southern Dobruja to Romania. Silistra was renamed "Dârstor" by the Romanians. Bulgaria regained the town from 1916 during World War I. This became finalised with the Treaty of Bucharest in 1918 after Romania surrendered to the Central Powers (of which Bulgaria was a part). The Treaty of Neuilly (1919) following World War I returned it to Romania. Silistra remained a part of Romania until the Axis-sponsored Treaty of Craiova in 1940, when the town once again became part of Bulgaria, a transfer confirmed by the Paris Peace Treaties in 1947. Between 1913 and 1938, Silistra was the capital of Durostor County, (except during Bulgarian rule). It became part of Ținutul Mării ("Sea District") between 1938 and 1940 during Romanian rule. Following the establishment of the People's Republic of Bulgaria, Silistra developed as a center of industry and agriculture in the region, comparable to Ruse (because of the strategic position on the Danube) and Dobrich (due to the abundant fertile lands). This led to a major population increase which continued until 1985. After that, the population slowly started to decrease. Following the collapse of the People's Republic in 1989, many of its inhabitants migrated to other parts of the country or emigrated outside Bulgaria.