“…These cities are major points of population growth, human transboundary movement, and commerce. The economic base of these two cities is strongly tied to the United States, especially the tourism and import–export activities of the maquiladora (industrial plant) industry involved in the production of textiles, chemicals, plastics, rubber, autos, and metals (Cañas, Fullerton, & Smith, 2007). The thriving international legal commerce, however, is matched by that of the illegal underground economy based on illicit drugs, sex work, money laundering, and contraband (Curtis & Arreola, 1991; Finnegan, 2010; Lacey, 2010).…”