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Mostly ideology and way of life.
Because United states back then was divided into north and south during the age of the industrialization. The northern believed in machines and technology while the southern believe in the agriculture and the land. That is why northern colonies more urban than southern colonies.
The rivalry between the northern and southern states started because of slaves. Northern states thought that it was wrong to force another human to be boughten and sold by other people that would wip them.
The Southern states formed The Confederate States of America and wanted to be a separate country. The Civil War prevented that.
in the north
Army of Northern Virginia or the Army of Tennessee and Northern armies were called the Army of the Potomac and the Army of the Tennessee.
either 22 states or 24 states
This was called the Mason-Dixon line and was first established in colonial times.
Mississippi was a southern state that joined the Confederate States of America.
southern states
In southern States.
no the southern states approved of slavery and the northern states dissapproved of slavery
AS YOU CAN SEE, NOT MANY STATES JOINED THE SOUTHERN STATES. MANY JOINED THE NORTHERN STATES !
The U.S was at war with itself, separated between the Northern states and the Southern states
The Union soldiers defeated the Confederate soldiers. The southern states surrendered and the northern states put many sanctions on the southern states after the war.
Because it was a wr between the northern state sand the southern states
Confederate and Union Boundary IMPROVEMENT The Mason-Dixon line