The only serious proposal for secession since the War between the States was completed has been this present proposal in Texas.
I don't believe that's true. I thought I read a story recently that several such petitions had been presented. There exists a protocol for doing so, which suggests that it's not particularly uncommon. It got newsworthy primarily because the backers in Texas wanted to to be so.
There are few reasons for most states to leave the alliance, so why would they?
Including Texas, for all manner of reasons. Which is why the vast majority of residents of Texas think these petitioners are mainly nutcases.
Up here in Alaska, we actually have an Alaska Independence which advocates for what the name stands for. It has been used on occasion by certain Republican candidates as a vehicle for running against other Republican candidates they don't like, and once in a while they succeed (Governor Walter Hickel, back in the early 1990s). Sarah Palin's husband, Todd, has had a dalliance with the AIP.
They're less active today than they were a while back, because the colorful and bizarre founder, a man named Joe Vogler, disappeared about a decade ago. The AIP folks tried hard to make this a political assassination, with (of course) the Federal Government behind it. Turned out he was murdered in a simple robbery, and his body buried in the woods near the remote place where he lived. The killer confessed, and led authorities to the corpse.*
Most of us think the AIP is full of nutcases, too.
caw
*Of course that story
could be part of
TVC (The Vast Conspiracy).