Henry D. Wallace, Desert Archaeology, Inc. – As a result of refined ceramic dating, we now know that a host of major changes in styles of decoration, and the appearance of new ceremonies, ritual architecture, and ballcourts with raised embankments, show up in what was likely an ethnically diverse range of populations all across southern and central Arizona within the span of a generation around A.D. 800. Discussed here is how this came about through a revitalization movement and the creation of sodalities that bound the region together with a common ideology and ritual framework, fostering economic interrelationships and population growth.