I have seen various history textbooks use the term "Ancestral Puebloans" in referring to the a group who lived in the American Southwest prior to circa 1500.
Most books say hese people dispersed and relocated to various newer settlements, such as Hopi, Zuni, Acoma, where many live to this day, with a collective title of "Puebloans".
When referring to other cultures, I haven't seen one attach "Ancestral" to the beginning. For instance, if studying Japan's history, I haven't seen books use the word "Ancestral Japanese".
So why do scholars affix the word "Ancestral" when referring to Puebloans prior to 1500?