Not sure if Texas can secede. More likely Texas can get kicked out. Meaning the US government can make the call to carve Texas out as its own country.
Maybe Texas should bribe all the snot nose panty wastes in Washington to vote to exclude Texas from the America.
Texas could probably agree to pay 10 years of federal taxes at the current level and of course the cash it takes to bribe the corrupt in Washington, and make the dream come true.
In my opinion, Texas would be getting off cheap if they could pull a deal like that off.
The border could then be sealed, in all directions, and us Texans could live a life of prosperity that we should be living.
Texas out, Puerto Rico in! If they need to keep it at 50 states.