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What would happen if a state, say Texas, secedes.

The USA refuses to recognize it, and prepares ground troops when the Texan government threatens a nuclear strike on any American attack forces, and for every Texan city taken, a nuclear strike will target an American city.

What happens?

It can be any state, but I chose Texas because its big enough to actually make this into a large enough problem.

Will the United States back off, or will it procede to launch nuclear strikes first in order to knock the key locations off and allow a seizure of the state?
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