November Constitution in Poland
Political event
Following collapse of German control over Poland, a new - provisional - constitution is made.
Kingdom of Poland, even after the changes made after the PiĆsudski was freed, was still a country heavily relying on German Empire. What's even worse, many organizational structures were planned and made according to kaiser's will, and that didn't sit well.
After the Ludendorff's Coup and Polish Army seizing western provinces, the German influences were practically expelled from the country. The crowning achievement was a provisional constitution written in hurry and made to last until the end of the war. Forming the current organization structure of Poland (that will last until the end of the Great War).