Dos Santos, dependence means a situation in which certain countries economies' are conditioned by the development and expansion of another to which the former is subject. He goes on to further clarify that the interdependence of two or more economies, and consequently world trade, assumes the form of dependence when dominant countries can create dependency only as a reflection of that expansion, which can have a negative effect on the subordinate’s immediate economy. Guyanese Marxist historian and political activist and one of the leading theorists on underdevelopment Walter Rodney contends in reference to Africa's underdevelopment, "The decisiveness of the short period of colonialism and its negative consequences for Africa spring mainly from the fact that Africa lost power. Power is the ultimate determinant in human society, being basic to the relations within any group and between groups. It implies the ability to defend one's interests and if necessary to impose one's will by any means available. In relations between peoples, the question of power determines maneuverability in bargaining, the extent to which a people survive as a physical and cultural entity. When one society finds itself forced to relinquish power entirely to another society, that in itself is a form of underdevelopment". Rodney also elaborates on his broader theory of underdevelopment and the issues of using the term especially in reference to comparing economies, saying "Actually, if 'underdevelopment' were related to anything other than comparing economies, then the most underdeveloped country in the world would be the U.S.A, which practices external oppression on a massive scale, while internally there is a blend of exploitation, brutality, and psychiatric disorder." See also Development economics Development theory Economic development Developed country Developing country References International development