In 1981 , Valero commenced its first vertical integration through the expansion into energy sector . The expansion was recorded through the acquisition of a small crude refining operation in Corpus Christi , Texas . In to speed up the production , at that time , Valero decided to spend over 1 billion to develop the state-of-the-art refining unit in the U .S . Moreover , the process to achieve the vertical integration objectives of Valero also happened in 1998 when the company decided to acquire Mobil 's...











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