The answer depends on the short- and long-term objectives of the manufacturer. Generally, foreign companies evaluate the advantages and disadvantages of establishing operations in a city or state in the U.S. that borders Mexico, or building a facility inside the country itself
Geography will have a direct impact on logistics and the cost of labor and these must be thoroughly researched before selecting a location. Other elements to consider include: wage structure, labor supply and demand, workforce stability (turnover and absenteeism), existing skills, skills development, work ethic, and union involvement related to a particular region.
Manufacturing Communities - such as the ones provided by The Offshore Group - in strategic locations in Mexico may also provide benefits beyond those achieved by operating as a standalone entity.