I am from London and am in London at the moment,but from 1991 to 1997 I lived and worked in Houston, Texas, as it was, I was running a games company!

Anyway, I found the Texan people to be extremely friendly and generous of nature. More so than other States I had lived in from Indiana, Minnesota to NY State. I have no doubt in a referendum 80% would vote to stay in the union.
Of course the reason for this is the fact that in the next 20 years Hispanic Americans will constitute the majority of voters in Texas! They will also represent around 30% of voters in the whole country!
Within that same 20 years is it likely the USA will be bilingual, with English/Spanish road signs,etc. Like they do, but in French, in Canada and in Welsh in Wales, etc.