 Furthermore, the banking system that had been nationalized in the waning hours of the López Portillo administration in 1982 were privatized, but with the exclusion of foreign banks.Salinas pushed for Mexico's inclusion in the North American Free Trade Agreement, expanding it from a U.S.-Canada agreement.The expanded NAFTA was signed in 1992, after the signature of two additional supplements on environments and labor standards, it came into effect on January 1, 1994.