Marcella has confirmed this as well - it’s in the statehood documents. If Marcella says it, then I believe it!
:) Being taught in a Texas school back in the 50’s does have advantages. It was understood Texas was a ‘special’ state due to exactly how we entered into the Union of States. Of course this was decades ago sitting in class, but the lesson, while not vividly branded in memory, a shadow still remains.