Economic Problems - Factories lost workers because men signed up for war, by 1918 Germany only produced 2/3 of their original before war, Government started running out of supplies.
War weariness - Food and fuel shortages, German public survived on bread and turnips. Wages kept low but factory owners made lots of profit supplying the war. Morale dropped, rebellions, strikes and protests
End of Monarchy - Kaiser abdicated, Germany becomes democratic republic, Frederich Ebert new leader of the Weimar government.
Defeat, "Stab in the back" myth - Weimar government surrendered to Allies, signed armistice (Nov 1918) ending war. Civilians angered as they wanted to continue fight, Weimar politicians who signed it were called "November Criminals".