Examination of Woodrow Wilson's concept of national self-determination in light of both Wilson's own intellectual development and the evolution of wartime strategy and diplomacy establishes that there was no prior consideration of ethnic or collective versus liberal or civic nationalism in Wilson's idea of ‘national’ self-determination and that the actual enunciation and application of the principle was deeply affected by considerations of wartime strategy and diplomacy, above all to counter defeatist tendencies following Russia's withdrawal from the war as well as to induce a separate Austrian peace. Wilson thus understood that the idea could not be applied in an unqualified way, that considerations of national self-determination might in specific instances have to yield to compelling questions of security, diplomacy and economics. At the same time, Wilson was not well informed about many key aspects of nation and state in East-Central Europe. In the end, Wilson accepted many unsatisfactory compromises at the peace table based on the promise that the League and its version of collective security held for international security and justice. Ignorance, liberal myopia, and political incompetence thus have to be weighed against Wilson's considerable tactical pragmatism in prosecuting the war when arriving at a final judgement on Wilson and the legacy of national self-determination.