King George III would have definitely approved of those websites.I Googled "can Texas secede from the union" and about 1,000,000,000,000 websites came up. Since I value my time, I only checked out a few of them. The main consensus is that for any State to secede from the union, it has to go before the Supreme Court and they have to approve it before any state can secede from the union.
The founding fathers apparently didn't.