“Then counties should be allowed to succeed from the succeeding states.”
Retract your /s tag because what you said could be close to the truth. Yes, there are some solidly blue states...and those could be cut loose. But many states have their little blue enclaves around the large cities...but lean decidedly Right in the majority of the counties. Just segregate the blue counties/cities with border crossings. In a state that went for Trump (NC), I’d gladly move out of my blue county into a nearby red county...and stand watch at the blue/red county line as a crossing guard.
(Believe it or not...we’re now actively looking to sell our home in “Blueville” and move to a red county...one that voted Trump 70%+.)
The states are the political entities that entered into the pact known as the USA. Complicating things like you suggest would lead to needless war and bloodshed.