Final answer:
The U.S. Congress did not fully support President Wilson's 14-point peace plan or the League of Nations. There was strong opposition from conservative senators and Allied leaders were more focused on their national interests post-World War I.
Step-by-step explanation:
President Wilson's 14-point peace plan and the proposed League of Nations did not receive the full support of the U.S. Congress. Wilson's vision, which emphasized self-determination, free trade, open diplomacy, and collective security, was met with skepticism and opposition. The League of Nations was aimed at establishing a world body to prevent future conflicts, but conservative senators, led by Henry Cabot Lodge, had reservations about possible entanglements in European affairs and the obligations involved in mutual defense as outlined in Article X. Wilson's hopes to garner widespread endorsement among his own nation's lawmakers were dashed, as they were unwilling to compromise American sovereignty and foreign policy autonomy.
Despite President Wilson's vigorous effort to win support for the League by embarking on a speaking tour in 1919, his health failed, diminishing the campaign's impact, and ultimately leading to the Senate's rejection of the Treaty of Versailles and the U.S. membership in the League. The international community at the time, particularly the Allies, were also not fully on board with Wilson's idealistic plan, as they were more focused on punitive measures against Germany and securing their own national interests post-World War I.
Therefore, it is false that the U.S. Congress came out in support of President Wilson's 14-point plan and the League of Nations.