Chapter 10 reappraises the evolving plans and visions for a League of Nations and a new, progressive international order that were advanced by Woodrow Wilson and those who came to advise the American president and contribute to the American peace agenda that was presented at the Paris Peace Conference. It reinterprets Wilson’s core aspiration as, essentially, the pursuit of a new Atlantic order – rather than a “new world order”. And it not only analyses the underlying assumptions and maxims of the peace programme that he and his core advisers elaborated after the end of the Great War – and the crucial changes they made to this programme and their approaches to peacemaking during the critical phase between the armistice and the peace negotiations at Versailles. It also evaluates how far Wilson and his advisers had drawn deeper lessons from the war – and how far the president’s reorientated ideas and strategies for a “peace to end all wars” actually met essential requirements that had to be fulfilled to create a durable and legitimate postwar order in and beyond the newly vital transatlantic sphere.