Final answer:
The feature of Southwest culture that was a holdover from the Archaic period was agriculture.
Step-by-step explanation:
The feature of Southwest culture that was a holdover from the Archaic period was the practice of agriculture. The Anasazi, who emerged in the Four Corners area around 700-1300 CE, were one of the earliest Southwestern groups and they supported themselves by growing crops such as corn. This agricultural practice led them to build large, complex towns and develop advanced techniques for farming and storing harvests.