 Serbs in Serbia on the other hand preferred either a Greater Serbia or a centralized Yugoslavia that would in effect create a Greater Serbia within it.The leadership of the Croatian Peasant and social democratic parties in Croatia and Slovenia generally supported a federal Yugoslav state that would recognize the equality of the Serb, Croat and Slovene nations as distinct and separate tribal sub-nations of the Yugoslav nation.As the Serbian military made advances against Austria-Hungary in the early months of the war, Serbian Prime Minister Nikola Pašić requested support from the Serbian parliament to support the Serbian government's official war aims that declared that Serbia would support the liberation of the Serbs, Croats, and Slovenes under Austro-Hungarian rule.