John d. rockefeller was able to monopolize the oil market, due to a) driving out or buying other oil industries; hiring only immigrants and former slaves, so he was able to pay workers far less money; received large investments from wealthy americans that allowed him to excel quicker b) vertical consolidation- buying/driving out all other oil companies and/or entrepreneurs and horizontal consolidation- buying into all other industries needed to minimize costs, maximize profits, and dominate the oil market c) horizontal consolidation- buying/driving out all other oil companies and/or entrepreneurs and vertical consolidation- buying into all other industries needed to minimize costs, maximize profits, and dominate the oil market d) driving out or buying other oil industries; hiring only immigrants and former slaves, so he was able to pay workers far less money; invested money into the campaigns of major political leaders to avoid strict business laws

The correct answer is C) horizontal consolidation-driving/buying out all other oil companies and /or entrepreneurs and vertical consolidation- buying into all industries needed to minimize costs, maximize profits, and dominate the oil market.

John D. Rockefeller was able to monopolize the oil market due to horizontal consolidation-driving/buying out all other oil companies and /or entrepreneurs and vertical consolidation- buying into all industries needed to minimize costs, maximize profits, and dominate the oil market.

John D. Rockefeller was the owner of the Oil-Standard Company. This Company practically controlled all the oil industry from 1870 to 1911. He created a monopoly by buying almost all the other oil companies and he had a vertical consolidation acquiring transportation and warehousing companies in order to reduce costs to a minimum and maximizes profits. He controlled the production process of oil, shipment, transportation, and selling.

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