Final answer:
Germany and Austria-Hungary faced economic instability, national debt, and political changes after World War I and the Treaty of Versailles. Austria-Hungary collapsed as an empire, leading to the formation of independent countries.
Step-by-step explanation:
Germany and Austria-Hungary faced several problems after World War I and the signing of the Treaty of Versailles. Germany was blamed for the war and had to pay war reparations, resulting in economic instability and a worthless currency. They also faced a huge national debt and a depressed population. Austria-Hungary collapsed as an empire, leading to the formation of independent countries like Hungary, Czechoslovakia, and Yugoslavia.