The Treaty of Versailles was a peace agreement signed on June 28, 1919, that officially ended World War I. It was negotiated among the Allied Powers, primarily the United States, United Kingdom, France, and Italy, and imposed heavy reparations and territorial losses on Germany. The treaty aimed to prevent future conflicts by establishing new borders and creating the League of Nations to promote diplomacy. The treaty included several key provisions, such as limiting the size of the German military and requiring Germany to accept full responsibility for the war. Many historians believe that the harsh terms contributed to economic difficulties in Germany and the rise of extremism, ultimately leading to World War II.