Contemporary scholars routinely argue colonialism and imperialism are indistinguishable. In this essay, I challenge this argument. While it is true the “colonial” and “imperial” overlap and intersect historically, I argue there is a central thread of modern colonialism as an ideology that can be traced from the seventeenth century to mid-twentieth century that was not only distinct from—but often championed in explicit opposition to—imperialism. I advance my argument in four parts. First, I identify key ways in which the colonial can (...) be distinguished from the imperial, including most importantly the specific kind of productive power inherent in colonialism. Second, I examine how colonialism and imperialism evolve in meaning and are redefined by both champions and critics, in relation to each other in the late nineteenth/early twentieth centuries. Third, I examine the historical moment when colonialism and imperialism fully conflate after WWII through the UN process of decolonization as the “salt water thesis” delimits colonialism to mean foreign racialized domination, and it thus becomes synonymous with imperialism. I conclude with an analysis of why the distinction still matters in both theory and practice. (shrink)