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…showed last 75 words of 1022 total…was the change in architecture. They had lived in circular huts in a slip-shod construction, now they were living in a permanent spot, they started to be more concerned about their place of residence. The most striking example was the Mounds that they started to build. Dd These were huge earthen mounds 20ft., and a number of mounds could be found. Visit Toltec state park in Arkansas. Mounds were raised for shelters against the elements.