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64 MEXICO AND CENTRAL AMERICA 
III. Post Archaic Horizon. 
Specialized cultures in North, Central, and 
South America dependent upon agriculture. 
Strong local developments in esthetic arts, re- 
ligious ideas, and social institutions. Agricul- 
ture extended to humid tropical and temperate 
regions. 
We will now make an effort to analyze still further the 
historical levels in the Post Archaic Horizon. 
