Texas constitution
Article 7: education
Section 3

(e) The Legislature shall be authorized to pass laws for the assessment and collection of taxes in all school districts and for the management and control of the public school or schools of such districts, whether such districts are composed of territory wholly within a county or in parts of two or more counties, and the Legislature may authorize an additional ad valorem tax to be levied and collected within all school districts for the further maintenance of public free schools, and for the erection and equipment of school buildings therein; provided that a majority of the qualified voters of the district voting at an election to be held for that purpose, shall approve the tax.