Final answer:
In the Case of the Vanishing Anasazi, Stanley would have been in the U.S. state of Colorado, specifically at Mesa Verde National Park, where the Ancestral Puebloan peoples built cliff dwellings and lived from 700 to 1300 CE.
Step-by-step explanation:
In the Case of the Vanishing Anasazi, Stanley (likely a character from a story or educational material) would have been in the U.S. state of Colorado. The Ancestral Puebloan peoples, also known as the Anasazi, built over 600 structures into the cliffs of the Four Corners region. A notable site of these ancient dwellings is Mesa Verde National Park in southwestern Colorado, where the Ancestral Puebloans lived from around 700 CE to 1300 CE.
The Ancestral Puebloans were known for their unique cliff dwellings and their sophisticated agricultural practices, such as growing the Mesoamerican triad, which included corn. However, by 1300 CE, these peoples had abandoned their remarkable structures and settlements due to a variety of reasons, including dramatic climatic changes such as the Great Drought, social pressures, and religious turmoil.
The legacy of the Ancestral Puebloans lives on in modern Pueblo cultures, and their remarkable cliff dwellings can still be visited today, providing a window into the past and enriching our understanding of ancient American civilizations.