What evidence do you find in the oral tradition that European culture influenced native American beliefs about creation?

In the Sioux creation story, the Creating Power flood the world because the creatures in it were bad and were destroying it. Then It put all of the living creatures on it again and humans as well, and told them that if they made the world bad and ugly once again, It would destroy that world too.

This creation story resembles the Christian flood myth, a story that the Europeans brought with them to the New World.