You could effectively divide the US east of the Mississippi River into probably five nations:
1. New England Republic - Maine, Vermont, New Hampshire, Massachusetts. Rhode Island and Connecticut.
2. The Confederate States of America - South Carolina, North Carolina, Georgia, Florida, Alabama, Mississippi.
3. The Northwest Confederacy - Ohio, Indiana, Illinois, Michigan, Wisconsin.
4. Virginia - Virginia, Kentucky, Tennessee.
5. The United States of America - New York, Pennsylvania, Delaware, New Jersey, Maryland.
In the West one could see:
Greater Louisiana - Louisiana, Arkansas
Texas - including New Mexico and probably portions of Arizona.
The California Republic - including Nevada and probably portions of Arizona.
Desert - Utah and Colorado.
The Sioux Confederation - North and South Dakota, Montana, Wyoming, Minnesota
Sequyoah - OTL Oklahoma, Nebraska, Kansas
Oregon Country - Oregon, OTL Washington and Idaho.
Centralia (The Central Republic) - Iowa, Missouri.
One could probably bundle the Carolinas together into their own nation.