Abstract The article analyzes Slovenian perspectives on the possible formations of a state of South Slavs from the final stages of World War I until when the Kingdom of the Serbs, Croats, and Slovenians (SCS) was established in 1918. In this period, the most influential Slovenian People's Party (SLS) gradually abandoned the concept of the May Declaration and accepted the idea of unification with Serbia. Despite Slovenian parties seeming to be in harmony on this issue, significant ideological differences separated them, as reflected in the geopolitical parameters of imagined Yugoslav state ideas they envisioned. Further, dissidents from the main parties also developed alternative visions of their own. This article looks at a few of the most prominent alternatives, while determining what distinguishes them from the requirements of the May Declaration, and examines the crucial factors in Slovenians’ decision to join the state of South Slavs with Serbia and to be outside the Habsburg monarchy.