The Freeport doctrine was Stephen Douglas’s doctrine that said slavery could be excluded from territories of the U.S. by local legislation. (Brainliest answer please) :)
<span>When examining how Rockefeller became successful, notice that he owned absolutely everything regarding the production and transportation. This means that the answer is C) Combined vertical and horizontal integration. He became a monopoly owner meaning he owned everything regarding the production of oil and didn't rely on anyone.</span><span />
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Explanation:
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