The sustained growth of foreign trade over the last two decades in the ZC has been made possible in part because the country ports had some surplus infrastructure and Which has been better exploited through a set of policies for optimization, improvement, sustained introduction of competition in the market for port services, asset-intensive, sustained increases in productivity, and the implementation of new investments Which have introduced new technologies, greater equipment and finally the incorporation of commercial management and private investment in the terminals. In addition to its origin in the growth of trade volumes, an additional factor detonating all these policies has been the substantive change in the patterns of demand for maritime services, with an increasingly intensive use of specialized vessels and homogeneous cargoes, Increase in ship sizes, higher frequency and number of shipping services and increase in cargo volumes at ports. The development and modernization of the SPQ began with the reconstruction of the two state ports in 1992, the enactment of the Law 19,542 on Port Modernization in 1997, the creation of state and autonomous port companies in 1998 and the operation of terminals under contracts of Port concessions as of 2000. The proximity and good connectivity of the ports of Ventanas, Valparaíso and San Antonio in relation to the ZC's consumption and production centers leaves these ports practically in a similar geographic and maritime position, In front of the same "Hinterland".