For most of this century, American foreign policy was guided by a set of assumptions that were formulated during World War I by President Woodrow Wilson. In this reexamination, Frank Ninkovich argues that the Wilsonian outlook, far from being a crusading, idealistic doctrine, was reactive, practical, and grounded in fear. Wilson and his successors believed it absolutely essential to guard against world war or global domination, with the underlying aim of safeguarding and nurturing political harmony and commercial cooperation among the great powers. As the world entered a period of unprecedented turbulence, Wilsonianism became a "crisis internationalism" dedicated to preserving the benign vision of "normal internationalism" with which the United States entered the twentieth century. In the process of describing Wilson's legacy, Ninkovich reinterprets most of the twentieth century's main foreign policy developments.