Suppose for whatver possible reason the United States breaks up early in its history (say, by 1800, 1810, etc) into 3 or more states ala Gran Colombia or the United Provinces of Central America.
What would be the economic impact of such a change, assuming the states remain divided as time passes? Additionally, what would be the demographic impact? Would there be shifts in migration patterns stemming from division, such as say, more people moving to New England cities instead of the Midwestern plains? Or would there just not be as much immigration from Europe period, and what then would that cause?
I do realize this is a bit vague in my parameters but I don't know enough about early American history to plot out a decent scenario off the top of my head.