Conversation so far:
What happened during the Civiano phase?
Between AD 1350 and 1375, the Hohokam tradition lost vitality and stability, and many of the largest settlements were abandoned.
Why did the Hohokam lose stability and vitality during the Civiano phase?
Rapidly changing climatic conditions apparently substantially affected the Hohokam agricultural base and subsequently prevented the cohesion of their large communities.
Did the Hohokam have any particular dressing style?
What other tribes were present during 300 to 1500 AD besides the Hohokam?
What happened to the Hohokam after 1375?
After AD 1375, the Hohokam abandoned the villages and canal systems within the lower Salt River basin.

Question: What is relevant about the medium years of this period?
Self-contained rewrite: What is relevant about the medium years of the polvoron phase?