It wasn't just a "texas" thing, tsugray. PVAMU was the only HBCU in the south/southwest to offer teacher certificates in the 1930s/1940s to minorities(check the range) so we actually had a decent presence in the Louisiana and Mississippi corridors as well (for advanced studies). I recall an elder informing me that one either had to go to PVAMU or attend one of the HBCUs in Atlanta-GA in order to receive that advanced cert (minorities). There were a # of undergrad GSU/SU alums who received their certs from PVAMU way back when. PV had, past tense, a decent stake in the Shreveport, New Orleans, Alexandria, and Baton Rouge areas for a few during the earlier to mid-1900s. Someone SU knowledgeable can collaborate that time period when SU started offering, as well as GSU.
Also, tsugray, remember that sTu was officially born in 1927 (?) as a private JUCO for minorities. It evolved to a 4-yr college some 20+ yrs later and then on to a state university a short time after. PVAMU was already established as a university during that timeframe and had traction throughout texas some almost 50+ years earlier than 1927. During that timeframe, it was sending grads locally to texas and afar in other states (like Cali/Chitown), who helped to recruit/direct students there.