Further population increase brought significant changes during this period. Irrigation canals and structures became larger and required more maintenance. More land came under cultivation, and amaranth was grown. House design evolved into post reinforced pit houses, covered with caliche adobe. Rancheria-like villages grew up around common courtyards, with evidence of increased communal activity. Large common ovens were used to cook bread and meats.
Crafts were refined. By about AD 1000, the Hohokam mastered acid etching. Artisans produced jewellery from shell, stone and bone and began to carve stone figures. Cotton textile work flourished. Red-on-buff pottery was widely produced.
This growth brought a need for increased organization and, perhaps, authority. The regional culture spread widely, extending from near the Mexican border to the Verde River in the north. There appears to be an elite class as well as an increase in social stature for the craftsman. Platform mounds similar to those in central Mexico appeared. They may be associated with an upper class and have some religious function. Trade items from the Mexican heartland included copper bells, mosaics, stone mirrors and ornate birds like macaws.