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Mexico's Senate has approved legislation to implement historic constitutional reform that would open the country's oil and gas industry to foreign investment for the first time since 1938. In an 85-26 vote, lawmakers passed the last of four packages of laws Monday to end the monopoly held by state oil company Pemex for 75 years in the exploration and exploitation of energy resources. The Chamber of Deputies must now vote on the measures, which the leftist opposition had tried to modify. President Enrique Pena Nieto hailed the marathon voting that began Thursday as an example of Mexico's "political civility and maturity".