A majority of Mexican state legislatures have approved changes in the constitution that open the country’s state-run energy industry to greater private investment and end a 75-year-old monopoly of state oil company Petróleos Mexicanos. Early Monday, San Luis Potosí became the 17th state to vote in favor of the bill, which amends the constitution to allow for private firms to explore for and produce oil and gas for the first time since the 1938 expropriation of the industry. Constitutional amendments in Mexico require a two-thirds majority vote in the Senate and lower house, and approval by a majority of the 31 state legislatures. Last week, the Senate and the lower house of Congress approved the changes, which amend the three constitutional articles that formed the core of the country’s restrictive energy laws. With the necessary state approvals, the Congress can declare the changes constitutional and send the bill […]