If secession is allowed and is actually engaged in (remember most people assumed it was allowed between 1789 and 1861, but through all but the last of those years it wasn’t actually done), the nation will atomize into a lot of little countries, and they will fight a lot of wars among each other. We think of it in terms of north and south because that’s what actually happened, but in addition to Dixie going its own way (maybe – last time didn’t work out so well), the West Coast might do the same, and possibly New England, and definitely Texas (Texans having no sense at all; I grew up there so I know), and also definitely Utah which never really wanted in the U.S. to begin with.
Why is there no war in North America today? Because the U.S. has nothing to gain from invading Canada or Mexico, and Canada and Mexico know they’d lose. Change either of those facts and you’d have war. We did invade Canada in 1812 and Mexico in 1846, the first because we thought we had something to gain by it (and were wrong), the second because we actually did (I’m living in what we gained).
Split the country into five or six fully-independent pieces, and war would be constant – at least until Canada and/or Mexico decided to gobble up those pieces. No, scratch that; Canada wouldn’t bother and Mexico couldn’t get it together, so it would just add another country into the fighting, which would go on.
Constant war means you can kiss whatever liberties you still enjoy goodbye, because you can’t have freedom in wartime. You can also say goodbye to the prosperity of the U.S., or such of it as we still have. If you’re young, expect to be drafted, 'cause there’s no way any of those little countries could rely on the luxury of an all-volunteer military. And at least once in your life and probably more often, expect to see where you lived shelled, bombed, invaded, and occupied by enemy troops.
Even in peactime, if you live in one of the little countries, you’d have to get permission to cross the border and move to another of them. There might (probably would) be tarriffs and trade restrictions.
It would just be bad news all around every which way. Let’s not go there, OK?[/i]