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How was rockefeller able to build his monopoly across the oil industry?
a) he bought up oil refineries, cut costs, and reinvested his profits in other refineries.
b) he confined his business to ohio so he could buy all the refineries there.
c) he found newer and cheaper ways to refine oil, increasing his profits.
d) he began to sell kerosene as well as oil, expanding his market.
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How was rockefeller able to build his monopoly across the oil industry?
a) he bought up oil r...
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