The idea of territorial expansion of Serbia was formulated in 1844 in Načertanije, a secret political draft of the Principality of Serbia made by Ilija Garašanin, a conservative statesman with Bismarckian aspirations. According to the draft, the new Serbian state could include the neighboring areas of Montenegro, Northern Albania, Bosnia and Herzegovina. In the early 20th century, all political parties of the Kingdom of Serbia (except for the Social Democratic Party) were planning to create a Balkan Federation, generally accepted the idea of uniting all Serbs into one only Serbian state which would be a part of the Balkan federation. From the creation of the Principality until the First World War, the territory of Serbia was constantly expanding.