The reasons native american culture was irrevocably changed by the end of the 1800s are?

The reason why Native American culture was irrevocably changed by the end of the 1800’s are the following;

-          There are heavy support in terms of the western migration

-          Abandoning of culture was usually common as the natives are set to become Americanized

-          No support of individual rights

americans had many intangible advantages. well since the british fought a war far from home military orders, troops, and supplies sometimes took months to reach their destinations, and the british had an extremely difficult objective. they had to persuade the americans to give up their claims of independence, americans had a grand cause: fighting for their rights, their independence and their liberty. this cause is much more just than waging a war to deny independence.

what are the options?