In this article I argue for a transdisciplinary approach to the human or social sciences. There is little ontological or epistemological justification for a division among these disciplines. I recommend that sociology stop worrying about policing its disciplinary boundaries and begin to encourage various forms of intellectual transculturation. I then analyze barriers to transdisciplinarity by comparing disciplines to states and comparing the relations among disciplines to different sorts of imperial practice, or interstate relations. The most common interdisciplinary strategies are analogous (...) to the informal, nonterritorial imperialism practiced globally by the United States. Three other forms of interdisciplinarity are discussed: the annexation of one discipline by another — a situation that is analogous to colonialism; nonhegemonized systems of equal disciplines (analogous to the Westphalian state system); and nonimperial `traveling' and transculturation among disciplines (analogous to the practices of members of weak or declining imperial states). (shrink)