Having lived in San Antonio (home of the Alamo) for several years, I found that state history is big in the educational system there. Natives refer to themselves as "Texians." The term "Texan" is what Hollywood adopted. I recommend printing out something like this
excerpt and putting it in an 8"x10" frame for your boss:
"Texian" refers to the Anglo settlers of Tejas y Coahuila and It's what they called themselves! This piece was originally in the New Orleans Bee then reprinted in TELEGRAPH AND TEXAS REGISTER on November 7, 1835:
"The proper name for the people of Texas seems to be a matter of doubt or contrariety: some calling the Texians, while others speak or write Texans, Texonians, Texasians, Texicans. We believe that, both by the Mexican and American residents of the country, the name commonly used is Texians; the Mexicans giving it the guttural sound of the Spanish language, as indicated sometimes by x and sometimes by j, Teghians. The sound is not used in the present mode of speaking the English language, although the Irish use it in the word lough, and the Scotch in loch, a lake. The nearest approximation is in such words as Christ. Texians is, therefore, the correct name of the people of Texas; and besides being short, it is perfectly analogous to the usual mode of forming the proper name of nations by the termination in n; as Greece, Grecian Persia, Persian. It may also be considered the euphonious abbreviation of Texasian. But Texonian and Texasite are absurd epithets."
The name "Tejano" makes the distinction of an indigenous citizen of Hispanic origin.
--The Editor"
Otherwise, a book on the indigenous history is good too. Something like:
Texian Iliad: A Military History of the Texas Revolution
Texians are proud of their history.