There are many things about the War Between the States which can be honestly debated but the fact that the North was the aggressor is not one of them.
What does Gitmo have to do with anything?
The Chi Coms did not in fire on Hong Kong even through it was owned by the UK.
At various times both the UK and the US did military build ups yet their bases were not fired on.
So your contention that "the North was the aggressor" does not hold water.
Of course the secession did not make any sense either.
And I never bought the "states rights" angle seeing as it was the South that repeatedly tried to impose it's will on the free states by demanding that they enforce slavery laws on free states land.