Germany transitioned to a democratic republic known as the Weimar Republic after World War 1. The Weimar Republic lasted from 1918 to 1933, beginning after Kaiser Wilhelm II abdicated and ending when Hitler rose to power. During this time, Germany experienced political instability, with the republic threatened by communist uprisings like the Spartacist Uprising in Berlin in 1919. The Weimar Constitution established democratic principles like proportional representation but also controversial measures like Article 48 that granted emergency powers.