The ensuing elections brought Rómulo Betancourt, who had been president from 1945 to 1948, back to power. Betancourt's government halted grants to multinational oil companies, created a Venezuelan oil corporation, and helped establish OPEC in 1960, an initiative led by Development Minister Juan Pablo Pérez Alfonso. The administration also introduced a new constitution in 1961, dividing the government into executive, legislative, and judicial branches; pursued agricultural reform; and promoted an international doctrine in which Venezuela only recognised governments elected by popular vote.