At www.thevintagenews.com/2019/11/14/florida-native-american-settlement/ … a LiDAR survey of Florida has thrown up evidence of a huge Native American settlement on Raleigh Island – going back to between 900 and 1200AD. This coincides with the Medieval Warm Period and we may suppose it was the changing climate around AD1200 that led to its abandonment – or possibly its capture by a hostile tribe. It was also at www.newsweek.com/ … but the link has now gone. LiDAR once again proving to be an effective archaeological tool, especially in challenging environments.
At www.dailymail.co.uk/sciencetech/article-7685227/ … which comes by way of Gary (one of four links he sent in). Archaeologists find a 3000 year old megalithic temple in Peru – apparently dedicated to a water cult. Possibly as a result of drought. The Chemu cultre, which was a variant of the Moche culture, was absorbed by the Inca empire. The finds date from the first half of the 14th century AD (1300-1350) which tends to suggest, although it was wet in NW Europe at this time, the tropical rain belt had moved away from the Chemu region. It weakened them it would seem as around AD1470 the Inca absorbed them. We have no idea at the moment if the Americas were affected by the Black Death epidemic. If so that would have contributed to their demise.