The 100th anniversary of regaining independence of Poland in 1918 is a circumstance towards which a jurist cannot remain indifferent. Following the consequences of the First World War, the intellectual and military effort of many generations of Polish independence activists turned into the long-awaited rebirth of Polish statehood after 126 years of oppression. The article analyses the normative aspects of reconstructing the Polish both during the warfare on the fronts of the Great War and just after it finished. Such an analysis cannot possibly be made without taking into account the impact of political decisions on the formation of the political system of the Polish state and that is why the author frequently makes references to the issues that are at the root of these decisions.