At the turn of the twenty-first century, historical studies of internationalism--above and beyond the call to the workers of the world to unite--have become the norm in a relatively short space of time. This shift has occurred in the context of a historical vogue for 'transnationalism,' that is, capturing experiences that traversed and transcended the borders of nation-states both within and beyond the European world. The work of the diplomatic historian Akira Iriye has been central to these developments, illuminating the (...) traces of a distinctively twentieth century history of 'cultural internationalism' that resonated through the realms of politics. Following in the footsteps of Iriye and others--including feminist and pacifist historians who had long engaged the internationalist past--a new cohort of international historians, often sensitive to cultural analyses and with expertise in imperial and transnational as well as national histories, are now accruing broad-ranging evidence of the geographies of internationalism and the political and economic reach of its various strands at critical moments in the twentieth century. (shrink)