Harsh conditions in Germany led to class conflict.
A section of Germany's land was given to Poland to give them to access to the Baltic Sea. This "Polish Corridor" separated Germany and East Prussia, dividing a same race and culture.
The new boundaries that were established caused major social problems because various ethnic groups were forced to mix. The establishment of Czechoslovakia, Yugoslavia, and other mixed countries caused major problems in the future.
The German people with the new government's acceptance of the treaty. There was turmoil in Germany during the 1920's which eventually led to the German people needing a strong leader. The leader that came was Adolf Hitler who eventually started World War II.
The working class people and women saw an increase in status after World War I. In the United States, women gained the right to vote in 1920.