Maybe it's because I was taught about the war in a north state, (and history sometimes changes according to who tells it, i.e. the history of slaves is very different when told by Caucasians vs. when African Americans tell it,) or maybe because I learned about it a century & ions ago & my memory is faulty, but according to the NORTH, the Southern states were always considered part of the U.S.
But, the South, like wayward teenagers sometimes do, declared their separation and considered themselves a separate entity.
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But that map is simply color coded to show you who was calling themselves what on a state government level.