Well, alot of the origonal Texans are not from the US but from Mexico. Up to 1/3. Alot of the US imagrants are not from Britan, but several other countrys.
Also the Texans married alot of the natives that were her making most native (several generations) Texans as being there for thousand of years.
ANd yes I have alot of relitaves in Texas. Thats why I know.