This chapter describes the origin of the idea of an American way of war. That idea began with the publication of historian Russell Weigley’s classic, The American Way of War: A History of United States Military Strategy and Policy, in 1973. For Weigley, a way of war essentially came down to habits of thought. America’s way of war, thus, had to do with the habits of thought of Americans with respect to armed conflict. This chapter also provides a brief survey of America’s armed conflicts, from its War of Independence to its interventions in Iraq and Afghanistan. This survey describes the major war aims in each of these conflicts as well as the type of military strategy employed.