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
Socialist Party of Transylvania the latter running instead in Transylvania. Consequently, 21 socialists were elected in the Chamber of Deputies and 3 in the Senate. The Congress tasked with the unification of the movement, initially set for April, was postponed twice, as the dispute regarding international dragged on. In the meantime, a regional Congress of the Socialist Party of Transylvania and Banat was held in Cluj during August 15-17, reaffirmed its support for an unified party and relinquished its independence, declaring it would abide by the programme and statute to be decided by the country-wide socialist Congress. A similar resolution was adopted by the