General mcclellan was reinstated as commander of the army of the potomac due to his ability to

General McClellan was reinstated as commander of the army of the Potomac due to his ability to prepare an army to fight. McClellan had originally been considered a poor commander by Abraham Lincoln, which led to him being replaced by General John Pope. However, Pope was defeated several times throughout the summer. Lincoln was forced to reinstate McClellan, because even though he was a poor field commander, he was very good at training the troops and boosting their morale. Lincoln believed that:

“We must use the tools we have. There is no man in the Army who can man these fortifications and lick these troops into shape half as well as he (McClellan). If he can’t fight himself, he excels in making others ready to fight.”

i believe its the indians

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.