Instrumental in creating the Army of the Potomac, this Philadelphia native graduated from West Point in 1846. He was chief engineer and vice-president of the Illinois Central Railway before the war, and became assistant secretary of war, following Tomas Alexander Scott. McClellan began his Civil War career as a major general with the Ohio Volunteers in April 1861 and achieved the rank of major general by May 1861. He was the commander-in-chief from November 1861–March 1862. McClellan was the Democratic candidate for president in 1864 and governor of New Jersey in late 1870s and early 1880s. He died in Orange, New Jersey.1999.068
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