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McClellan enjoys his first day of existence on Earth.
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McClellan begins attendance at the United States Military Academy.
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George McClellan graduates from the U. S. Military Academy with second rank in his class of 59 students.
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George B. McClellan joins the Mexican-American War on the American side to serve under General Winfield Scott, who he would later meet in the Civil War.
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McClellan is made the chief engineer of Illinois Central Railroad.
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McClellan resigns from the military so that he may work for the Illinois Central Railroad.
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McClellan is promoted to the vice-presidency of Illinois Central Railroad.
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Only a few days after the commencement of the American Civil War, William Dennison, the then-governor of Ohio, appoints McClellan as the Major General of the Ohio Volunteers.
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McClellan is commissioned a major general in the Regular Army.
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McClellan receives the Thanks of Congress for his efforts fighting in western Virginia.
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McClellan leads the Army of the Potomac at the Battle of Antietam. The battle ends in a draw.
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The United States Department of War orders McClellan to abdicate control of the Army of the Potomac.
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In December 1862, McClellan suffers from typhoid fever
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McClellan unsuccessfully runs for the position of President of the United States in 1864. He ran under the Democratic Party, while his incumbent opponent Abraham Lincoln ran under the National Union (Republican) Party.
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McClellan serves as the 24th Governor of New Jersey, running for the Democratic Party.
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McClellan dies at Orange, NJ. He is buried in Riverview Cemetery, Trenton.