After regaining independence, the Second Polish Republic faced the problem of the legal systems inherited from the three partitioning powers. This situation was also reflected in social insurance and more broadly in social security. The most developed insurance system existed on the lands of the former Prussian partition. This was due to the fact that Germany was the birthplace of social insurance. A developed system operated in the former Austrian partition, while almost no such system existed in the former Russian partition. Centralised sickness insurance was the first to be introduced in the Second Polish Republic. In January 1919 the Decree on sickness insurance came into force, later replaced by the Act of 1920. The work on social insu...