If I moved to Texas and was granted residency, I would consider myself a Texan.
You’d be a resident of Texas not automatically a Texan. Being a Texan is a state of mind and position of birth.
I once encountered a FReeper who said he was a former Texan. (Ain’t no such animal.) He lived in California but he was a native-born Texan. I told him he is and always will be a Texan - no matter where he resides. He stopped calling himself a former Texan.
My children promise that no matter where they live, they will ensure that my grandchildren are born on Texas soil.