The Free State of Prussia (German: Freistaat Preußen) was a German state formed after the abolition of the Kingdom of Prussia in the aftermath of the First World War. It was the major state of the German Reich during the time of the Weimar Republic, comprising almost ⁵⁄₈ (62.5%) of its territory and population.Free state is another German term for republic that was coined in contrast to the Latin word, which was associated with the enemy France in the minds of many Germans of that time.

The democratic Free State of Prussia was rendered incapacitated when it was taken over by the Preußenschlag (Prussian coup) of 1932–33 and Otto Braun was forced from office. His government went to court over this ouster, but in 1933 the Nazi regime seized control of the Prussian government.

From 1933, the Free State was deprived of parliamentary democracy and ruled exclusively under the leadership of the National Socialist German Workers Party (Nazi Party). Initially, Prussia was administered by high-ranking Nazi Hermann Göring who was appointed Minister-President of Prussia. In 1935, the Free State's territory was dismantled into regional Gaue, some of which incorporated both Prussian and non-Prussian territory, thus effectively ending Prussia as a single territorial unit of Germany. Although the Free State of Prussia continued to exist in name under the premiership of Hermann Göring throughout the Nazi era, by 1935 the Prussian government had been effectively absorbed by the government of the German Reich and Göring's position as Minister-President had been relegated to a titular role in comparison to his more prominent duties in the government of the Third Reich.

...
Wikipedia