Henry White: Thirty Years of American Diplomacy by Allan Nevins. Harper & Brothers, 1930.

A Worldcat search shows it in most of the university libraries in my area, so perhaps you'll find a similar result in your area. They may have access to an online version. I can't find that one exists, at least not one downloadable through my university. They have the book on the shelf on the Central Library 4th floor.

These are part of the contents:
Taft, Roosevelt, Wilson: the world in arms --
America at war: the foundations of peace --
Peace Conference: the Council of Ten --
Peace Conference: Wilson and Lodge --
Peace Conference: the crucial phase --
Peace Conference: rejection of the treaty --