Feudal society is the key. [definitional]
The historical development of world capitalism was influenced in a most fundamental way by the particularistic forces of racism and nationalism. This could only be true if the social, psychological, and cultural origins of racism and nationalism both anticipated capitalism in time and formed a piece with those events that contributed directly to its organization of production and exchange. Feudal society is the key.
Cedric J. Robinson, Black Marxism_ The Making o…, loc. 151