Final answer:
The evolving frontier fostered a diverse and dynamic cultural mix in Texas.
Step-by-step explanation:
The impact of the evolving frontier and its eventual closing on the culture of Texas was that it fostered a diverse and dynamic cultural mix in the state.
The frontier brought together people from different backgrounds and cultures, resulting in a unique blend of traditions, languages, and customs.
For example, the Southwest Borderlands of Texas were a melting pot of ethnic and cultural conflict, with Anglo cowboys, Native Americans, and migrants from Mexico interacting and influencing each other's cultures.