J.P. Morgan was a prominent figure during the Progressive Era, and two of his notable accomplishments are:
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Helped expand and improve the railroad - J.P. Morgan played a significant role in the consolidation and financing of various railroad companies, which helped to improve and expand the railroad network in the United States.
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Started a very successful financial investment company - He founded J.P. Morgan & Co., which became one of the most important banking institutions in the country, facilitating large-scale corporate financing and investment.