This chapter lingers on the very notion of territory itself as a spatial imaginary, a literary trope, and a political crucible for competing ideas of sovereignty. In particular, it examines how territory, or perhaps more precisely, territoriality, did not simply work at the behest of US empire but also served as an essential spatial register for working alongside and even against US territorial annexation, occupation, and colonization. Throughout the nineteenth century, the United States asserted an understanding of sovereignty that foregrounded dominance over a territory and its inhabitants. At the broadest scale, territory denoted the sovereign’s property (the United States), and sovereignty denoted control over territory. Settler-colonial notions of sovereignty and territory conflicted with Indigenous understandings of sovereignty that often foreground responsibility to human and other-than-human relatives within a shared space or territory rather than possession of property. This chapter’s three sections, “Terra Nullius,” “Indian Territory,” and “Black Territories,” each take up a concept of territoriality that profoundly influenced US colonial expansion at the expense of other narratives of placemaking. Each section details how narratives of territoriality forcefully shaped US politics and culture while also describing competing notions of placemaking that disrupt these dominant narratives.