I looked around before posting, but the closest to this ends up with a nuclear dystopia of sorts.
Anyway, let's assume that after the Battle of Antietam Lee decides to throw the dice again and stays in the field, thinking he can stop the Army of the Potomac. McClellan becomes unnerved by this, thinking Lee will receive reinforcements, and leaves the battlefield.
How would this affect the war? The events play out as in OTL, only now Lee is leaving for Virginia victorious. Also without the victory the Emancipation Proclamation might take longer to be released. What about England and France? If I remember correctly they were waiting for a Confederate victory on Northern soil to intervene.
Anyway, let's assume that after the Battle of Antietam Lee decides to throw the dice again and stays in the field, thinking he can stop the Army of the Potomac. McClellan becomes unnerved by this, thinking Lee will receive reinforcements, and leaves the battlefield.
How would this affect the war? The events play out as in OTL, only now Lee is leaving for Virginia victorious. Also without the victory the Emancipation Proclamation might take longer to be released. What about England and France? If I remember correctly they were waiting for a Confederate victory on Northern soil to intervene.