The Carolinas remain Carolina

The Carolinas (North Carolina and South Carolina) were known as the Province of Carolina during America's early colonial period from 1663 to 1710.
The province was divided into South Carolina and North Carolina in 1729.
Suppose Carolina is not divided, Carolina remains Carolina.
Carolina is one of the American colonies. However, there are Twelve Colonies, not Thirteen Colonies. What happens then?
 
The Province of Carolina is the same size as Georgia, Pennsyvania and Virginia.
So there is not really an issue with size, meaning not much will be different. In my opinion, as a European.
 
Well, one of the reasons that there was a split was that North Carolina's main area of settlement was around New Bern and the like, tying it much more to Richmond's interests more than Charleston. This was one of the earliest divides between the Upper South and Lower South we had.

To keep the Carolinas united, its likely a chunk of OTL North Carolina would go to Virginia.
 
How's this going to affect the slave vs. free state balance in the expansion period of the 19th century? Will it weaken the South in the Senate enough to lessen the issue altogether (doubtful) or will it force one of the Free states of OTL to either go Slave or remain a territory? Will we see an earlier civil war? This is of course, ignoring the potential butterflies that will alter the course of the 19th century in America.
 
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