The developed states of North America have not experienced transnational integration to the same degree as those of the European Union. Indeed, some scholars have argued that North American States and the border functions which define their territorial limits, are essentially unchanged in the face of globalisation, hardening rather than softening, and remaining unabashedly archaic and state-centred. This article suggests that although there has been considerable change in the border functions and geopolitical discourses which mediate transnationalism among the highly developed North American states – namely Canada and the United States – the nature and structure of transnational integration has remained more limited than that of the EU. It argues that the reasons for this more limited international integration agenda lie in the specific geopolitical discourses which sustain cross-border institutions and national identity before and after 11 September 2001 (‘9/11’). The Canadian state, for example, has demonstrated considerable resistance to greater levels of integration with the United States, at the same time that it has became increasingly open to cross-border trade under NAFTA. This resistance is based upon a national-identity discourse that relies upon distancing the Canadian state from its larger neighbours to the south. At the same time, however, the national security discourse which has emerged in the Canada and the United States following from 9/11, has failed to close borders to increasing levels of economic integration, and must accommodate the need for a degree of openness to the heightened levels of cross-border trade under NAFTA. As a result, there has been considerable reorganisation and reorientation of borders within North America. It is simply inaccurate to view the continent as a place where borders have remained unyielding to the broader forces of globalisation. If the role of borders in maintaining security while facilitating trade has resulted in an increased awareness of, and concern with the Canada-US border, the latter is not simply a continuation of ‘old-fashioned state-centred geopolitical concerns’ but is instead a newly-fashionedpost-9/11 response to the ramifications of globalised trade and terrorism.