A logistic growth equation is used to model México's epidemiological and fertility transitions, creating variables used to model the spatial diffusion of demographic change across the states. Consistent with the goals of the Lázaro Cárdenas administration, the epidemiological transition unfolded uniformly across the states, accessible to rich and poor alike, but the urban-oriented family planning programs introduced by Luis Echeverria have favored elites, have diffused selectively, and have ensured that the burdens of the population explosion have borne down most heavily on the poor and the remote.