This article compares European nationalism and earlier notions of political community in Europe and Asia. Without denying the discursive novelty of post-1750 nationalism, it argues that eighteenth-century social and economic incentives to ethnic integration in individual European countries accelerated much older dynamics. Moreover, in the same period, c. 1400–1850, as state-centred ethnicities cohered in Europe, similar processes produced broadly comparable formations around the rimlands of Asia. Together, Europe and the Asian rimlands thus generated an early modern cultural system – distinctive from both nationalism and universal empire, but possessing features of both – that I term ‘political ethnicity’. The novelty and idiosyncrasy of this Eurasian-wide formation has yet to be recognized. Why, then, in Europe alone did political ethnicity eventually produce nationalism? Using Myanmar and Britain as case studies, the article argues that in Europe distinctive medieval legacies joined religious ruptures and exceptionally rapid commercial expansion to compress religious authority, to diffuse metropolitan norms with unprecedented rapidity, and to transfer sovereignty from the crown to propertied interests speaking in the name of the ‘nation’.