In this chapter "charitable historical organization" means an entity that:
(1) is organized as a nonprofit organization;
(2) has its main office at an institution of higher education, as that term is defined under Section 61.003, Education Code; and
(3) maintains an established educational department that provides:
(A) opportunities for students in this state to study and work to preserve the history, heritage, and symbols of this state; and
(B) training and resources to assist educators in developing effective strategies to teach students about the heritage, history, and symbols of this state.