Why did France join the league of nations?

On the eleventh hour, of the eleventh day, of the eleventh month of 1918, the Armistice is signed effectively halting the War. The final Treaty of Versailles, is signed on June 28, 1919. This treaty that ended WWI was attended by the major nations but excluded Germany in the writing of the treaty. Demands of Nations France demanded Germany return Alsace and Lorraine and cede the Rhineland and the valley of the Saar River Italy demanded the Tiroi region and the cities of Trieste and Flume Great Britain demanded all of Germany's African possessions Belgium demanded two small portions of German territory along its border Japan demanded ownership of the Marshall, Caroline and Mariana islands as well as Qingdao and Shandong Peninsula in China. It also asked the powers to recognize its "special position in China"