The settler myths he spoke of reminded me of America's obsession with mythology at large. DC is the perfect example of how America has historically adapted and appropriated Roman mythology and ideas of empire to spin the narrative of their position as today's great empire. In the Capitol there is a painting on the ceiling in one of the rooms called The Apotheosis of George Washington. It features GW in a godlike manner surrounded by Roman gods and goddesses. With this sort of obsession with Roman mythology, it makes sense that in order to further establish a historical origin of White American settlers, that they would also attempt to adapt Viking history and Norse mythology.
Another good connection to this topic is a book called Settlers: The Mythology of the White Proletariat. It argues that while white Americans attempt to align themselves with the proletariat and erase the fact that the founding fathers were landowners and slaveowners, they possess a petit-bourgeois consciousness and that the only true proletariat are the descendants of the colinised Native population and enslaved Africans.