The Mexican energy sector was nationalized in 1938.  With the establishment of Petróleos Mexicanos, a state-run monopoly was formed.  “Pemex” essentially ushered foreign investors out the door. In the ensuing decades, Pemex earnings that plumped Mexican tax coffers came to account for

Since 1938, Mexico’s vast petroleum resources have been controlled by Petróleos Mexicanos, or Pemex, the state-run oil and gas monopoly.  But late last year, the Mexican government changed the rules of the game.  Plagued by slumping domestic output that kept the country from taking ad