There is no genetic or archaeological evidence that the Mandan are related to the Welsh, however, and John Evans and Lewis and Clark reported they had found no Welsh Indians.
虽然没有基因上的或考古学上的证据证明曼丹人与威尔士人有关系，但是，约翰·埃文斯以及刘易斯和克拉克都报导说他们没有发现威尔士印第安人。