Which of the following was not an effect of the United States joining the war?

A. The war tipped the balance of power in favor of the allies , allowing them to win the war

B.The war cost so much money that it plunged the U.S. into the Great Depression .

C. The war boosted the United States ' power and prestige making them a world power for the first time.

D. The war emboldened President Wilson to suggest a League of Nations to prevent wars like this from happening again .​