The Treaty of Versailles was one of the peace treaties at the end of World War I. It 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. The other Central Powers on the German side of World War I were dealt with in separate treaties. Although the armistice, signed on 11 November 1918, ended the actual fighting, it took six months of negotiations at the Paris Peace Conference to conclude the peace treaty. The treaty was registered by the Secretariat of the League of Nations on 21 October 1919, and was printed in The League of Nations Treaty Series. Of the many provisions in the treaty, one of the most important and controversial required "Germany [to] accept the responsibility of Germany and her allies for causing all the loss and damage" during the war. This article, Article 231, later became known as the War Guilt clause. The treaty forced Germany to disarm, make substantial territorial concessions, and pay reparations to certain countries that had formed the Entente powers. In 1921 the total cost of these reparations was assessed at 132 billion Marks. At the time economists, notably John Maynard Keynes predicted that the treaty was too harsh—a "Carthaginian peace", and said the figure was excessive and counterproductive. The historian Sally Marks judged the reparation figure to be lenient, a sum that was designed to look imposing but was in fact not, that had little impact on the German economy and analyzed the treaty as a whole to be quite restrained and not as harsh as it could have been.