unexplored at detailed regional scales. Studying 271 human genomes dated~ 4900 to 1600
BCE from the European heartland, Bohemia, we reveal unprecedented genetic changes
and social processes. Major migrations preceded the arrival of “steppe” ancestry, and at~
2800 BCE, three genetically and culturally differentiated groups coexisted. Corded Ware
appeared by 2900 BCE, were initially genetically diverse, did not derive all steppe ancestry …