What event likely gave the united states more influence in post-war peace negotiations

The attitude of president Woodrow Wilson to obtain a treaty based on justice gave the United States more influence in post-war peace negotiations

After the war the Allies were filled with grudging anger. They asked for a treaty that would punish Germany harshly. They wanted to make Germany weak by destroying its military and industry. And they wanted to destroy Germany's economy by making it pay all war damages. Germany, they said, must never go to war again.

President Woodrow Wilson of the United States did not agree completely with the other Allies. He wanted a peace treaty based on justice, not bitterness. He believed that would produce an enduring peace.

President Wilson had led negotiations for a truce to end the hostilies of World War One. Now, he hoped to take a main part in negotiations for a peace treaty. To be effective, he required the full support of the American people.  

the answer is 250 percent.