Exceptionalism refers to the belief that the United States is uniquely positioned to dictate its values and actions globally due to its perceived superior knowledge and morality. This viewpoint has shaped both the daily experiences of its citizens and the overarching strategies of its foreign policy. It reflects a conviction that the U.S. has a moral obligation to lead the world based on its unique status.

In "The Brothers", Stephen Kinzer discusses how this notion was integral to the lives of influential figures like John Foster and Allen Dulles. Their belief in American exceptionalism drove their decisions and shaped the political landscape, portraying the U.S. as a benevolent force on the world stage, even when that perspective often masked underlying motivations and consequences.