They asked. Yugoslavia was founded before Versailles, so when the Conference opened it was already a fact on the ground. Doubtless there were those within each camp who wanted an independent Croat-Slovene state or those who wanted a Greater Serbia, but in the end what was agreed upon was a united South Slav state. At the time the lands which would become Yugoslavia faced expansionist demands from neighbours like Italy or Romania; this combined with genuine feelings of Yugoslav nationalism led to the various factions deciding on a compromise. Serbia dominated the union from the start because it was the only one with the proper army and institutions, and the Serbian elite must have known this.