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wo hundred years ago, on March 21, 1790, Thomas Jefferson arrived in New York City to assume his duties as secretary of state, the first under the new national government. No man had a greater impact on the day-to-day conduct of American foreign policy than Jefferson during his long life of public service. And throughout the course of American history few can rival Jefferson as a living symbol of the nation's purpose. That his writings might be invoked on every side of a given controversy has always added to the uses of the Jeffersonian past; all the great conflicts of the nineteenth century—over slavery, union and democracy—found partisans on either side appealing to the" sagacious aphorisms and oracular sayings" of the great Virginian. The same has been true in foreign policy, where Jefferson's name has been invoked on all sides of the ever-recurring debates on the nation's diplomatic stance.