There were people here before the Clovis (and possibly much before) but their method of chipping points for spears and arrows was so distinctive that they were considered as 'first' or 'foremost' of the hunter gatherer population. There is almost no doubt that Arizona was the place where irrigated farming first came to prominence and the people used the rivers to their advantage. It made for more leisure time for society in general and led to fantastic advances in art and pottery.