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Published online by Cambridge University Press: 31 December 2019
I am going to say a few brief words this afternoon about one of the great myths in American constitutional law. That is the myth that the federal government has exclusive power over foreign affairs, the myth that the United States is always required to speak internationally with one voice. That myth is flat wrong. It is belied by the constitutional text, by subsequent practice, and by the functional purposes of federalism. Consider each in turn.