Attributing revolutionary potential to new international communications technology, notably the internet, is not new. On a global scale, similar ideas emerged in the mid nineteenth century in relation to government-subsidized mail steamers. These visions remained utopian, then as now, although some nations went further than others in attempting to implement ‘world peace’ and ‘social improvement’ through communications. Before widespread electrical transmissions, Americans created the blueprint for such utopian visions through mail steamers. Americans had long considered their postal system socially transformative; the development of mail steamers turned that social vision outwards to the globe. This article examines two movements of the 1850s that sought change through global communications: using mail steamers to resettle American free blacks in Africa and reducing international postage rates to such a low rate that increased communications would prevent war. These two nearly simultaneous histories suggest that the evolving concept of the nation-state deserves further investigation as an element at the conjuncture of global communications and social reform.