A pdf is available by request from jmheyman@utep.edu . Chapter is in Spanish. Argues for a historical, social struggle based approach to Marxist analysis of borders and migration (in the case of the U.S.-Mexico border) rather than a capitalist-functionalist kind of Marxist analysis. Covers three topics: differential and unequal mobility through borders in unequal class-nationality settings (addressing in this section the concept of global apartheid); border enforcement as a mechanism of labor disciplining and control; and militarization of the border as a means of social control. In each case, it argues for an emergent and complex rather than abstract systems logic analysis of these topics. It concludes by pointing out that the relation between capitalism and the state remains incompletely understood.