In what year was the Texas Constitution amended to guarantee equality regardless of "sex, race, color, creed or national origin"?

Question

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The Texas Constitution was amended in 1972 to guarantee equality regardless of "sex, race, color, creed or national origin". The other options (1836, 1928, and 1955) refer to years when the Texas Constitution was adopted or amended, but none of those included this particular provision.

In What Year Was the Texas Constitution Amended to Guarantee