In my opinion it was Wilson as he was a president during WW1 and his main idea was to establish peace and to created an organization that will prevent conflicts to happen. On the other side, both Roosevelt and Taft wanted to spread the power of United States outside their domain.
Explanation:
A the end of 19th and beginning of 20th Century United States became an imperialistic power and even waged wars to spread their power. United States became a super power in that period. Still, when WW1 started president Wilson believed that United States should not participate in it. Even, when they entered in 1917 his main goal after the war ends was to create League of Nations.
