No. We should annex Canada instead.
I read somewhere that there were plans by a victorious North to invade Canada which had served, during the war, as a conduit point for Confederate soldiers and terrorists to attack various northern cities.
Yes and the British came vary close to forcing the North to the bargaining table by threatening alliance with the CSA. The French were also probably ready to ally with them in actuallity. Damn good thing the battle of Antietam was spun as a victory both here and abroad allowing Lincoln to issue the Emancipation Proclamation preventing any such European-CSA coalition or "Mandatory Arbitration" if you will
. (Sorry couldn't resist the obvious conotations.)