The conclusion of the Paris Peace Conference did not mean the world had truly found peace. Japan, for instance, refused to sign at the conference, because the Paris Peace Conference dominated by the Big Three had severely restricted its room for development.
Not only would it lose more than half of the German Pacific Islands already in its grasp, it would also be forced to relinquish Germany's sphere of influence in the Far East. This was something the Japanese government could not accept!
Fine, if they would not sign, then they would not sign. Britain and France were far stronger in this era, while Japan was far weaker than it had been after World War I in history. With one side strong and the other weak, Britain and France naturally had no reason to yield!
No one knew how long the Japanese could hold out. In any case, they had no allies in this matter. Even the Americans, who had likewise been suppressed at the conference, stood on the opposite side from them!
Britain and France showed the world through reality that it was best not to provoke them. The Twenty-One Demands concocted by the Japanese had escaped intervention during the war because Britain and France lacked the energy for it; now, with one move, they knocked the Japanese back to their original form!
And this was only the beginning. The signing of the Treaty of Versailles had placed a crushing economic burden upon Germany, while also laying the foundations for the revival of the German economy.
However, the Germans had retained more territory than they had during the same period in history. For example, amid vehement opposition from Russia and Austria, and because the British did not wish to weaken Germany excessively, German Poland was not granted independence.