What was an effect of the United States entry into World War I? A) The Ottoman Empire immediately surrendered to the Allied powers, realizing that its fight was futile. B) Britain shifted most of its troops to the eastern front because they were no longer needed in France. C) Tensions developed between American and French troops over who would occupy the best trenches. D) The arrival of fresh troops to the Allied side forced Germany to agree to a cease-fire within a year.