The best way would be quiet quitting. Making routes to federal buildings surrounded by construction and road closures at odd times. Overlapping federal job descriptions internally and never communicating with federal equivalents unless required, and that with a “great email, still working on that!” Or “emailed Oregon about that and they had some great ideas, get with them for the data!”

Offering great state guard contracts to all military eligible to re-up, that exceed what the feds offer. Build out coastal protection fleet due to “them darn migrants.” Train your military in FPV as if you were what the US should be doing right now, so the feds know any pushback will be costly, and you’re not breaking any laws anyway, remember?

Tell your state and local police we don’t work with the FBI or IRS in cooperation any more, and let the populace know the feds must individually enforce all tax law. That’s where it’s good for the Feds to remember that’s not required, and the 4th amendment prevents them being forced to act… in fact, that makes them subject to arrest for trying due to the laws of the great state of california.

All legal, and petty. But legal.

The state government would put forwards a local movement to secede from the US, and if it actually passed the federal government would butt in and go "you can't secede, that's completely illegal and unconstitutional" (it is), at which point the state would either go "oh well" and stand down or say "go suck eggs" and continue trying to secede, which the federal government would treat as rebellion or insurrection.

There is no process. States cannot just up and say "see ya" on their own, we fought a war over that.

If the people felt that it would be OK for a state to leave, the proper thing to do would be to pass an amendment stating a process, and then the state would do it. There would be a lot of details to hammer out: does the State get to keep Federal property (like military bases)? Does it inherit a share of the deficit? What happens to deferred US taxes on things like 401k accounts?

IMHO it would take so long to hammer that stuff out that it's basically impossible.

In short: War. I'm not being hyperbolic either.

It's not possible - you can check out but you can never leave

Legally, a state can't secede really, but the other states could agree to let it go. It would require a Constitutional Convention, which would require 2/3 of states to agree to let it go.

That's what the Civil War was about, there is no legal way to exit were one nation period end of story millions of dead soldiers proved it.

If a state tried to leave they would have to prove they could no matter the laws. It would be war. No ifs ands or buts. That means having a military that could take out the US military. Currently the top Airforce in the world is the US Airforce, the second largest Airforce is the US Navy, then it's Russia, then it's the US Army. Unless you can somehow convince the military to side with you when you leave, it's not going to happen. I would imagine if you tried to claim it legally the best you could hope for is Federal agents walking in the second said state gov claims independence, and idk arresting the heads of state for treason, and telling said state to elect a new gov.

You need to amend the constitution which requires 38 states to agree to it that considering how many right wing states hate California doesn’t sound impossible

There is a historical example, but given the outcome, I don't think it would be a good idea to follow that blueprint.