Transylvania as originally defined in Treaty of Trianon, 27 years earlier, thus confirming the return of Northern Transylvania to Romania. From 1947 to 1989, Transylvania, along with the rest of Romania, was under a communist regime. The ethnic clashes of Târgu Mureș occurred between ethnic Romanians and Hungarians in March 1990 after the fall of the communist regime and became most notable inter-ethnic incident in the post-communist era. The Transylvanian Plateau, high, is drained by the Mureș, Someș, Criș, and Olt rivers, as well as other tributaries of the Danube. This core of historical Transylvania roughly corresponds with nine counties of
1848–49 massacres in Transylvania 1848–49 massacres in Transylvania The 1848–1849 massacres in Transylvania were committed in the Hungarian Revolution of 1848. According to Egyed Ákos, 14,000 to 15,000 civilians were massacred in Transylvania in this period. The victims were composed of 7,500–8,500 Hungarians, 4,400–6,000 Romanians, and about 500 Saxons, Armenians, Jews, and members of other groups. Throughout 1848 and 1849, the Hungarians in Transylvania became exposed to the oppositions and repressions of Romanians and Transylvanian Saxons. The Romanian massacres were justified as revenge for the Szekely offensive over the Romanian communities. On 18 October 1848, Romanians attacked and murdered the inhabitants of the village