Answer
After WW1, the Treaty of Versailles was signed, which imposed heavy reparations on Germany and led to economic instability. The League of Nations was also established to promote international cooperation and prevent future wars. Many countries experienced social and political changes, including the rise of communism in Russia and the suffrage movement for women. The war also led to advancements in technology and medicine, but also left a lasting impact on the mental health of soldiers and civilians.