Who were Andrew Carnegie, J. P. Morgan, and John D. Rockefeller and what industries did they control

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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its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.