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What made Standard Oil a horizontal integration monopoly?
It owned ninety percent of US oil refineries.
It controlled all aspects of oil production.
It operated all across the United States.
It formed a trust.

User Sjkp
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2 Answers

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Answer: it owned ninety percent of US oil refineries

Step-by-step explanation:

User Dlu
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Answer:

Refining sector

Step-by-step explanation:

User Imran Arshad
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