The factor that best explains why Native Americans were able to make permanent settlements is the development of agriculture. The transition from a nomadic lifestyle to a settled one was largely influenced by the domestication of crops and animals, which allowed various Native American groups to cultivate food and establish stable, year-round communities.
With the ability to grow staple crops such as maize (corn), beans, and squash, many tribes were able to sustain larger populations, create surplus food, and establish complex societies. This agricultural foundation led to more permanent settlements, where people could focus on developing culture, trade, and governance.
Additionally, factors such as environmental conditions, access to resources, and social organization also played roles, but agriculture stands out as the most significant factor in facilitating permanent settlements among Native Americans.