 This dovetails nicely with the "transformation" theory that native Jōmon peoples changed gradually with the infusion of Yayoi immigrants into the Tōhoku rather than the "replacement" theory which posits that one population (Jōmon) was replaced by another (Yayoi).There were numerous revolts by the Ainu against the feudal rule.The last large-scale resistance was Shakushain's Revolt in 1669–1672.