What positive impact did Elijah McCoy have on the US

Elijah McCoy (1843?-1929) made important contributions to the design of railroad locomotives after the Civil War. He kept pace with the progress of locomotive design, devising new lubricating systems that served the steam engines of the early twentieth century.

Explanation:

Elijah McCoy (1843-1929) made important contributions to the design of railroad locomotives after the Civil War. He kept pace with the progress of locomotive design, devising new lubricating systems that served the steam engines of the early twentieth century.

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