It was becoming clear that Mexico possessed world-class oil reserves. In 1974, the country started, in a very small way, to sell petroleum abroad again, though the export of oil was criticized by some as running against the tenets of Mexican nationalism. While production was rising, the engineers in Pemex continued to be very cautious in their estimates of reserves through the last years of the Presidency of the radical, nationalistic Luis Echeverría Álvarez. But matters changed with the election of a new President, José López Portillo, in 1976. López Portillo, who had been Echeverría’s
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