衛氏朝鮮
The disappearance of the Liaoning bronze dagger culture from China appears to coincide with the State of Yan's conquest of that area. The Korean bronze dagger culture of the Later Phase appears to correspond with the state of Jin, which occasionally enters Chinese annals as a contemporary of Wiman Joseon. Lee (1984, p. 13) views this as the period of emergence of the "walled-town states" in Korean culture, a hierarchical political structure in contrast to the tribal system which had prevailed during the Neolithic period.