@thltd_: Study: IQ decline caused by im...

Study: IQ decline caused by immigration, miscegenation, and potentially dysgenics contributed to the collapse of Roman Empire. openpsych.net/paper/73/

Averages of Imperial era samples from Rome and Etruria are half Middle Eastern:
ncbi.nlm.nih.gov/pmc/articles/P…
science.org/doi/10.1126/sc…

The combined averages of all non-outlier samples are highlighted in yellow here. Recent European, Middle Eastern, or North African migrants (marked _o) were excluded from these averages. Most migrants probably came from Anatolia, Greece, North Levant.

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