The age of Croatian politics during the First World War is marked by numerous conflicts and mutual turmoil. When the First World War began in 1914, Croatia was an integral part of the Austro-Hungarian Empire and the administration was divided between the Austrian and Hungarian parts of the country. Croatian question about unification has been a problem that the Dual Monarchy avoided. After such situations Croatian politicians were forced to strive for the best possible resolution of the political situation of that time, and thus began an unstable period that has brought about major political change. Through the tumultuous years of the war there are possible three potential solutions for Croatians - stay in the renovated Austria - Hungary, the creation of an independent state, and the third possibility is entering into the community of South Slavs. In these tracks was established and the Yugoslav Committee based in London whose leading politicians were the originators of politics "new course". Also, part of the Croatian representative is established and the Yugoslav club in Vienna. In addition, Croatian and politicians are essential to develop a National concentration. Furthermore, Krf ` s Declaration provided an immediate solution to this dilemma. Also, the war was ending and the drop of the Hapsburgs had been completed. After that, the State of Slovenes, Croats and Srbs were proclaimed. This was soon followed by the announcement of unification of countries in Kingdom of Serbs, Croats and Slovenes on 1 December 1918., The new creation is not provided desired conditions for national development of individual nations gathered within its borders.