Then, huge natural stone buildings started to appear approximately 850 AD, whereas earlier the Archaic Anasazi were living in pit houses. These buildings are Great Houses, & they are present as piles of rubble even now at Chaco National Historic Monument Building construction and technological innovation techniques never before seen in the South-west USA were put into use to construct these great houses. Kivas and Great Kivas happened to be a chief attribute of The buildings named Great Houses, these rounded, underground chambers were most likely utilized for rituals. A flourishing contemporary society persisted for around 300 years, up until undetermined irregularities or situations stimulated the inhabitants to disperse. Mass migration out of the area might have been set off by the lack of regular precipitation, variations in local weather, or troubles with the ethnic heritage. Chaco Canyon National Park during the years 950AD until 1150AD is the ultimate true mystery story of the Southwestern USA.
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