The Treaty of Versailles (French: Traité de Versailles) was the most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between Germany and the Allied Powers. It was signed on 28 June 1919, exactly five years after the assassination of Archduke Franz Ferdinand. It became effective on 10 January 1920.
The U.S.—German Peace Treaty is a peace treaty between the U.S. and German governments, signed in Berlin on August 25, 1921. The main reason for the conclusion of that treaty was the fact that the U.S. Senate did not ratify the multilateral peace treaty signed in Versailles, thus leading to a separate peace treaty. Ratifications were exchanged in Berlin on November 11, 1921, and the treaty became effective on the same day. The treaty was registered in League of Nations Treaty Series on August 12, 1922 .