Secession from the Union is a bit of a touchy subject in the United States. It brings up all sorts of bad memories and unfortunate stories- an enormous Civil War, one of the largest in history, can do that to a nation. It’s a bit of a sore point on all sides, which is why any modern threat to secede from the Union is never really taken with any seriousness. It’s always assumed that they’ll fail.

But that’s not to say that they don’t happen. In fact, they happen all the time. South Carolina (the state to secede first in the prelude to the Civil War) does it with alarming frequency, most recently threatening to secede over the recent controversy surrounding the Confederate Flag. There’s also been the regular, if vague and less politically motivated, movement for the creation of the Republic of Cascadia- a sovereign nation composed of northern California, Oregon, Washington, and parts of Canada.

But while these sort of things are often talked about in a vague sort of way, either to make a point about a political position or to just bluster about (looking at you, South Carolina), it’s not often that a real, honest-to-god secessionist movement props up in the United States.

One of the most prominent cases, however, is Texas.

Texas has an interesting history- it’s basically the only state in the union that was ever an internationally recognized sovereign nation, and that sort of a thing leaves a legacy. Texan identity is a powerful force, and even though the oft-touted rumor that Texas is the only state with the right to secede from the Union is completely incorrect, Texan succession movements are some of the most vocal and powerful in all of the United States.

In fact, there’s one going on right now. Spurred by Obamacare, changes to immigrant laws, and concern over economic stability, the Republic of Texas movement has never been stronger. It’s nowhere near strong enough to actually force through an act of secession- a relatively recent poll determined that as few as 18% of Texan citizens would support a secession movement if it came down to a vote.

Despite that, the movement is still very vocal. Just a month ago, the Viscount Lord Christopher Monckton spoke in front of a crowd of 15,000 in Austin, Texas, and supported the concept of a “Texit”- a legal referendum for the secession of Texas from the United States, and a mirror of the “Brexit” that occurred earlier this year. Lord Monckton, who is a controversial figure in British politics, might not have gotten far with his largely Texan audience, but the fact that 15,000 showed up to listen to him talk about secession says something.

But while Texas might have one of the most vocal secession movements in the nation, one of the most popular might be found in Hawaii. The Aloha State has always held grievances with the United States federal government- most stemming from the fact that their native government was overthrown by plantation owners in the 1800s, and then forcibly annexed into the Union shortly after. As a result, the Hawaiian Sovereignty Movement has always been one of the most powerful and popular pushes for secession in the United States. They haven’t held an actual referendum- yet- but who knows what the results of such a vote would be.