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The best history book I ever read on The South indicated that extensive research found that some definitions included Texas, some didn't. Some included Florida, and some didn't. Etc.

Georgia, Alabama, Mississippi, and a few others were consistently included in all definitions of The South. "Edge" states for the region varied tremendously.

That would be the deep south.

https://en.m.wikipedia.org/wiki/Deep_South

The capital of the Confederacy was in Virginia, but you’ve decided that it’s not in the South.

Let’s try Wikipedia instead. https://en.wikipedia.org/wiki/Southern_United_States

Geographically, sure. However, "the South" can mean a lot of different things. e.g. "the South" culturally does not apply to much of Virginia, Texas, or Florida.

As clearly stated in the first paragraph of the Wikipedia article I linked, you’re confusing the “Deep South” and the “South.”

The south is the states that lost the civil war. It goes past Mississippi.

That's only one way of defining it. Without context, it can mean many different things.