This already happened once before.
South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, North Carolina and Tennessee seceded from the United States between 20 December 1860 and 8 June 1861.
They were crushed in 4 years.
This ain't 1861, my friend. Millions of able-bodied American men are NOT going to jump out of their seats and join the US military to stop any state from seceding. The feral US government will have to make do with what military personnel they have, which at last count, is about 600,000 active duty.
There are an estimated 90 million gun owners in this country who possess an estimated 270 million firearms, and I can guarantee you that most of them are south of the Mason Dixon line. If the folks down here suddenly decide they're going to secede, there's not a damn thing that Washington will be able to do to stop them.
Are you sure you’re in the right place??? Sounds to me like your panties are too tight.