Answer:
To end World War I a treaty was signed by all nation who fought in it to gain peace, this treaty was the Treaty of Versailles. German lost the war and it was decided by the allied to punish German harshly. The Treaty of Versailles made German pay the dept, gave up its territories, reduce weapons and troops, no aircraft so on. This all led to the rise of the Nazis under Hitler and caused World War II.
If Woodrow Wilson's Fourteen Points had been adopted instead of the Treaty of Versailles there would not have been any WW II, Cold War and American involvement in Europe. Wilson's Fourteen Points were more idealistic and less harsh on German.
