The biggest problem with secession is the number of residents who currently depend on Social Security and other Federal retirement plans they worked for and earned - them Gubmint folks understood the potential ramifications of another Civil war and worked tirelessly over the last 150 years to insinuate the Feds into everything they could for a reason - to maintain control despite what the Constitution says.
I know of expats in HK that still receive SS benefits.
The issue would be not so much those receiving but those in their 50’s that haven’t started yet.
I am on SS and I would give that tie to the Communist controlled DC crowd in a New York minute.