This final paper briefly describes the life of Dr. Ivo Pilar from the earliest days to his death. The work is based on the political activity and affirmation of the Croatian National Union (HNZ), the first political organization of Croats in Bosnia and Herzegovina, as well as Pilar's most important work, The South Slavic Question, which deals with the “Croatian question” and its solution in the form of the unification of the Croatian countries. The initial part describes the life and family of Ivo Pilar. Furthermore, the paper follows his political work and fight for the rights of Croats in Bosnia and Herzegovina, as well as his work on the annexation of Bosnia and Herzegovina to the mother country, the Kingdom of Croatia, Slavonia and Dalmatia. Moreover, the above mentioned unit presents The South Slavic Question and Ever Again Serbia which is followed by a chapter that defines geopolitics as well as answers to the question why Pilar is the founder of Croatian geopolitics. The final chapter describes the suspicious circumstances of Pilar's death.