The correct answer is C) the League of Nations.
Woodrow Wilson and President Truman would have disagreed about the following organization: the League of Nations.
US President Woodrow Wilson was an active participant in the peace deals after World War I. He was interested in a longlasting peace and when addressing the US Congress he established 14 points to get permanent peace in Europe. Indeed, the speech is known as the "14 Points Speech." However, when most of the European nations were favoring the creation of a League of Nations, President Wilson did not like the idea of the United States to be part of the League and preferred to maintain a foreign policy of neutrality. That should have been a major difference with President Harry S. Truman.
The other options of the question were A) The New Deal. B) the Potsdam meetings. D) NATO.