Hell yeah the North would have used them. Most people don't grasp how close the North was to losing the war at a couple different times.
Nuclear technology in the 1860's? We would probably have ended up with a nice cheap clean source of power for our whole country.
Life would be like Road Warrior, if we somehow developed cars after a nuclear war. Because if not, it would be like that piece of shit called the Postman. Just imagine it, driving all day in search of fuel, food, etc. and killing your way through it. I'd wear leather and a brace on my leg for no reason.
Not really. People focus too much on Virginia and the eastern theatre which makes the war look much closer than it was. The Confederacy was losing the war from day one in the western threatre and that is where the war was ultimately won.