Final answer:
NAFTA is an economic stimulus, English is a common commerce language, Rio Grande is ecologically endangered
Explanation:
The Rio Grande is now one of America's least ecologically endangered rivers is not correct about modern South Texas. The river faces many ecological challenges, including pollution and water management issues.
NAFTA (North American Free Trade Agreement) has been a significant economic stimulus for the Texas border region. It has promoted trade and economic growth between the United States, Mexico, and Canada.
English, not Spanish, is the language of choice for commerce for many Anglo Americans in the region, showcasing the diverse linguistic landscape in modern South Texas.
Learn more about Modern South Texas here:
https://brainly.com/question/8241932