Texas in effect is saying 'We are being invaded' and so can make war in return, and defend her borders. The fact that States still exist as independent from the Federal government and can make war in certain circumstances within the US Constitution, without any need for Washington or Congress, means they can do a lot to save themselves.
If England were to go for independence from the UK, the same would apply to England.
That's why the Teds want England to be independent, and a referendum to be held.
That way we can defend our borders with troops - a million Captain Mainwarings on Warmingtons On Sea, nullify NATO membership, abandon the 2018 UN migration Pact, leave the World Health (i.e.Death) Organisation, the WEF and all the rest, and re-establish Common Law, and our legal system, and have proper law and order in our cities as we used to do.