Which Native American culture are you referring to, the Navajo, the Taos,
the Mescalero Apache, the Jicarilla Apache, the Hopi, the Santa Clara, the
Jemez, the Zuni or some Peoples? The Navajo and the Taos speak languages
as different as German and Italian. There are at least 5 separate languages
among the Puebloans. You are assuming a Pan-Native American culture that
never existed except maybe in Hollywood. Furthermore, all Native Americans
did not experience the total physical eradication that the Native
Newfoundlanders did at the hands of the European Canadians.
Many members of the tribes I listed live in their traditional culture and
would very much resent it being dismissed as "destroyed".
BTW: The sovereign tribes of the Navajo and the Hopi happen to be currently
in a state of aggression towards each other. They are sufficiently
sovereign to have "foreign" policies. Few puebloans like the Navajo and
some actually prefer Anglo company to Navajo. Since I spent a significant
part of my "growing up" time with the Navajo I sort of side with the Navajo
but can understand the Puebloan point of view.