What U.S. county tried to separate itself from Texas on two distinct occasions and penned its own Declaration of Independence?

Van Zandt County has tried to break away from the U.S. state of Texas twice over the course of history. In the first instance, Van Zandt County was unhappy about Texas's cession from the union, as it was with little slaves. So, the county decided that they should be able to secede from Texas. The second time, Van Zandt tried to secede from the nation as a whole. This attempt failed, but their declaration of independence was never repealed, so it is technically still in effect.