This book brings together international relations scholars, political theorists, and historians to reflect on the intellectual history of American foreign policy since the late nineteenth century. It offers a nuanced and multifaceted collection of essays covering a wide range of concerns, concepts, presidential doctrines, and rationalities of government thought to have marked America’s engagement with the world during this period: nation-building, exceptionalism, isolationism, modernisation, race, utopia, technology, war, values, the ‘clash of civilisations’ and many more.