“My reference to the “USA’s invasion of the USA” was an oxymoron designed to remind another poster that the South remained part of the USA despite the fact that some people in the South pretended to “secede” from the USA. “
He’s making the same argument that the Crown used for waging war against the British Colonials to force them to remain in the Empire- the Colonies remained a part of the United Kingdom and only “pretended” to secede and become independent.
The lesson - When you go to war, you can win or you can lose. Lincoln didn't lose. He preserved the Union.
And today, nearly every American (North, South, East and West) is grateful that Lincoln preserved the Union. And, they're grateful that the Union ended slavery.
One nation, under God, indivisible. We're so lucky to be here.