In January 1919, leaders from 27 nations joined together in Paris, France. It was for a peace conference following WWI.
Woodrow Wilson's plan for peace includes the Fourteen Points, dealing with adjusting the boundaries in Europe and creating new nations. The points supposefed national self-determination.
National self-determination: the right of people to decided how they should be governed
The League of Nations was a group of members that would preserve peace and prevent future wars, respecting and protecting one another's independence.
Germany and Russia were excluded from the peace talks. The Big Four: President Wilson, Prime Minister David Lloyd George of Great Britain, France's premier Georges Clemenceau, and Italian Prime Minister Vittorio Orlando.
Everyone but Woodrow Wilson wanted revenge. Clemenceau wanted Germany broken into smaller countries. He and Lloyd George demanded that Germany make payments for the great damage during the war.
On June 28, 1919, the Treaty of Versailles was signed by the Allies and Germany.