[E. Pluribus Unum]

The country splits into two parts, neither of which can resist the aspiration of foreign powers. The South eventually becomes part of Mexico, and the North once again comes under control of Great Britain.

[Alberta's Child]

I'd say it's more likely that the U.S. would have ended up a lot like Canada today -- a weak (on a global scale), loosely unified country where much more power is vested in the provincial/state governments.

Ironically, in many respects Canada is probably much closer to what the Founders of this country envisioned than what the U.S. has become since the Civil War.

[DiogenesLamp]

The country splits into two parts, neither of which can resist the aspiration of foreign powers. The South eventually becomes part of Mexico, and the North once again comes under control of Great Britain.

Southern Confederacy eventually acquires the border states, the territorial states, and eventually acquires the rest of the Union. Charleston becomes the major center of Finance for the Nation instead of New York.