A postwar order without American belligerency

How would the postwar world change if the United States remained neutral throughout the First World War?

American influence over the settlement would be much smaller, making Wilson's Fourteen Points, the League of Nations, and the historical naval-treaty system unlikely.

A neutral United States would lack the leverage it historically exercised at the peace conference. European belligerents would have little reason to adopt Wilson's program, so the League of Nations and the later naval limitation framework would not emerge in their familiar forms. The answer makes postwar institutions contingent on wartime contribution rather than on American proposals alone.