The book outlines the political face of the North-Eastern Borderlands Polish Republic in 1918-1939 and characterizes basic elements and features of the political system under which the conflicting interests of different communities represented by various political groups. Political life in the borderland different from the situation in the rest of the country. It was determined by external and internal factors. Its shape was due to the nature of the border, so the geopolitical, ethnic and social structure, ownership typical of the north-eastern borders. It should also pay attention to the specific economic situation and the system of administration in the area. It is important for the development of political life in the North-Eastern Borderlands also had a systemic change in interwar Poland. Evolution of the parliamentary system in an authoritarian direction substantially changed the political map of the region.