Germany was known as the Weimar Republic during the years 1919 to 1933. It was a republic with a semi-presidential system. The Weimar Republic faced numerous problems, including hyperinflation, political extremism (including violence from left- and right-wing paramilitaries), contentious relationships with the Allied victors of World War I, and a series of failed attempts at coalition government by divided political parties.[5] Severe setbacks to the German economy began after World War I ended, partly because of reparations payments required under the 1919 Treaty of Versailles.