Entire Human Populations Vanished 3,000 Years Ago. Scientists Figured Out Where They Went.

Key Points:

• Researchers have uncovered a new explanation for the neolithic population decline around 3100 B.C.E. in northern Europe, linked to a dramatic demographic crisis and population turnover.
• Analysis of a 5,000-year-old megalithic tomb near Paris revealed two distinct burial phases separated by a 200-year gap, corresponding to a widespread population drop and subsequent repopulation by Iberian farmers around 2900 B.C.E.
• DNA evidence shows the first phase burials were genetically diverse farming populations, while the second phase consisted mainly of homogeneous Iberian ancestry, indicating a complete population replacement rather than gradual cultural change.
• The population decline coincided with environmental changes, shifts in farming practices, and the presence of ancient pathogens such as plague and relapsing fever, suggesting infectious disease and environmental stress contributed to the collapse.
• This demographic vacuum allowed neighboring groups, including Iberian farmers in the Paris Basin and steppe pastoralists in Scandinavia, to migrate and repopulate the region, ending the long-standing tradition of megalithic tomb construction.