Modern capitalism emerged in the early nineteenth century in western Europe and the European offshoots of the Americas and Oceania. Recognizing the unparalleled dynamism of the new socio-economic system, Marx and Engels predicted in 1848 that capitalism would spread to the entire world. By the end of the twentieth century, that prediction was confirmed: capitalism had indeed become global, but only after a tortuous and violent course of institutional change in many parts of the world. This paper provides a brief account of the emergence of global capitalism, and discusses some of the reasons why the diffusion of capitalism has been so conflictual and violently contested.