Answer:
Carnegie was able to monopolize the steel industry from 1889 to around 1901 when he sold his business to J.P. Morgan, the U.S.'s most prominent banker. John D. Rockefeller founded the Standard Oil Company, which dominated the oil industry and was the first great U.S. business trust.
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9 states were needed to ratify the Constitution to put it into effect.
Henry Moore cut holes in his sculptures.
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The answer is D. The union won despite many casualties
