EN
Belarusian Self-determination process of 1917-1920 included several attempts resulting in different levels of success. This process was reflected in the adoption of several constituent acts of different shapes, which declared state sovereignty. The historical and legal analysis of constituent acts of Belarusian People’s Republic (1918) and of the first soviet Belarusian republic (1919) is presented in this article. The structure and the contents of this acts are analyzed, features are revealed. The historical and legal assessment of the acts is given. The Bolsheviks replaced the slogan of national self-determination by the slogan of „self-determination of working people”. They opposed attempts of self-determination by the nations of the former Russian Empire. This was done through the proclamation of Soviet national republics. An integral part of this policy was the declaration of the Soviet republic of Belarus on 1 I 1919. This political tactic allowed the Bolsheviks to justify the invasion of the Red Army troops in the regions of national self-determination.