Germany, a powerful empire in the early years of the twentieth century, fought the First World War (1914-1918) alongside the Austrian empire and against the Allies (England, France and Russia.)
Germany made initial gains by occupying France and Belgium. However the Allies, strengthened by the US entry in 1917, won , defeating Germany and the Central Powers in November 1918.
The defeat of Imperial Germany and the abdication of the emperorgave an opportunity to parliamentary parties to recast German polity.
A National Assembly met at Weimar and established a democratic constitution with a federal structure. Deputies were now elected to the German Parliament or Reichstag, on the basis of equal and universal votes cast by all adults including women.
. The Allied Powers demilitarize Germany to weaken its power. The War Guilt Clause held Germany responsible for the war and damages the Allied countries suffered. Germany was forced pay compensation amounting to £6 billion
The peace treaty at Versailles with the Allies was a harsh and humiliating peace. Germany lost its overseas colonies, a tenth of its population, 13 per cent of its territories,75 per cent of its iron and 26 per cent of its coal to France, Poland, Denmark and Lithuania.