大セルビア
In response to the outbreak of the war a number of Croats and diaspora Serbs supported Croat-Serb cooperation against Austria-Hungary with the desire of creating a federation based on cooperation between them. 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.