And it still took four long, hard, bloody years. A few rolls of the dice resulting in different "alternatives" .. or General Jackson not being stupid enough in riding outside his lines in the dark at Chancellorsville .. and your "brief and bloodless" Civil War would have ended after only maybe two years.
You don't see the difference. The southerners were brave and proud and knew how to fight. Modern liberals are weak, decadent and lack a moral compass. They are "all hat and no cattle."
BTW--most military historians believe that the outcome of the American civl war was a foregone conclusion. Even if Stonewall lived, it utlimately would have been of little consequence.