Anyway, back to tequila - the lime and salt thing didn't start in Texas. However, Texas was once part of the country that did ...

This salt is also found in the sun-flower, tobacco, and other plants. The suits of lime occur in solution in almost all waters : thus the river, spring, and well water, in this vicinity ...

and then mixed with sulphate of soda or salt cake as the manufacturers call it ; this affords a beautiful acetate of soda, in solution, which is then drawn off from the remaining sulphate of lime.