What government were they trying to overthrow? And i'm using the word "overthrow" in the context of Napoleon overthrowing Louis XVI, or Lenin overthrowing Tsar Nicholas II.
Meaning the "overthrown" end up dead once the "overthrowing" is complete. You know, like in an actual "revolution."
What government were they trying to "overthrow"?
The southern rebels would have replaced the US Constitution with the Confederate Constitution.
I don't think they had any intention of making New York, Massachusetts or any of the other Northern states live under the Confederate constitution. They could continue living under the US constitution so long as they wished. Therefore the US Constitution would not have been "replaced." It would still be in effect for those states that wanted it.
Read the definition. Or social system in favor of a new one. The US Constitution was the social order in the southern states, they wished to replace it with the confederate constitution. It’s not a hard concept.