The agreement that signifies the end of World War I is the Treaty of Versailles, signed in 1919. This treaty placed heavy reparations and territorial losses on Germany, leading to significant political and economic changes in Europe. The conditions of the treaty were aimed at preventing future conflicts but ended up fostering resentment in Germany. The treaty established the League of Nations in an effort to promote peace and cooperation among nations, although its effectiveness was limited. The repercussions of the Treaty of Versailles played a key role in the lead-up to World War II.