During the 1992–95 war, around one-third of the population of Bosnia and Herzegovina - it seems particularly Muslims or Bosniacs - migrated abroad as well as to other parts of the country. The territory of the Bosnia and Herzegovina was traditionally divided into two portions: Bosnia covers its northern and central parts and Herzegovina the southern parts. Since the Dayton-Paris Peace Accords, both these parts have been divided between the Entities of Republika Srpska and the Federation of Bosnia and Herzegovina. During the early Middle Ages, Bosnia and Herzegovina did not have a similar sense of internal political cohesion as other regions in the Balkans for a few principal reasons. The historians “complained that some Serbs and Croats cavalierly dismissed uniquely Bosnian manifestations of state authority as mere tribal unions.” Hungarians started to invade Bosnia and Herzegovina in the middle of the twelfth century.