This chapter focuses on John Robert Seeley (1834–95), the most prominent imperial thinker in late nineteenth-century Britain. It dissects Seeley's understanding of theology and religion, probes his views on the sacred character of nationality, and shows how he attempted to reconcile particularism and universalism in a so-called “cosmopolitan nationalist” vision. It argues that Seeley's most famous book, The Expansion of England (1883) should be understood as an expression of his basic political-theological commitments. The chapter also makes the case that he conceived of Greater Britain as a global federal nation-state, modeled on the United States. It concludes by discussing the role of India and Ireland in his polychronic, stratified conception of world order.