|This article does not cite any references or sources. (December
2009)| The Chaco tribe is a native American tribe in South
America who built complex stone edifices that aligned with solar
and lunar trajectories. The Chaco had no written language and so
all knowledge required for building their structures had to be
passed by word of mouth over many (25+) generations. The Chaco
abandoned their structures over an extended period of time,
meticulously sealing and destroying their structures. |This
South American history-related article is a stub. You can help
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