Why internal sovereignty is a matter of supremacy while external sovereignty is a matter of independence?

Which of the following best describes how the texas constitution of 1876 has changed since its enactment? there has been only one major overhaul. there have been several major overhauls. the constitution has undergone piecemeal revision. the constitution has doubled in size nearly every year since its enactment. the constitution has remained essentially unchanged from when it was first enacted.