Item 4 How did the entry of the United States affect ​ World War I ​ ? It led to more than a million United States troops aiding the Allied cause by 1918. It led to an immediate proposal of talks negotiating an armistice and formal end to the war by Germany. It allowed United States supplies to be received by the Allies for the first time. It canceled loans Germany had acquired from the United States to finance their war effort.