Which technological development is most closely associated with the native Americans who lived in what is now the southwestern corner of the US?

The technological development most closely associated with Native Americans in the southwestern corner of the U.S. is the creation of adobe structures. These sun-dried mud bricks were used to build homes and other buildings, reflecting an adaptation to the arid climate of the region. Additionally, the development of irrigation systems for agriculture, particularly for growing crops like maize, beans, and squash, was crucial for sustaining their communities. Together, these technologies highlight the ingenuity and resourcefulness of these Native American cultures in a challenging environment.