I am white and Native American from (reputedly) both sides, and would like to speak to a little of that assimilation thing…
This is on the maternal side - there’s always been a great deal of pride in this history - even to the fact that my great-great-great grandma took off with another man. 
The coast Salish were Not Pleased at the white incursion, and vigorously objected to their presence - including the burning of Fort Nasqually in 1849. However, between 1849 and 1856, when the peace treaties were made, Pat Kanim - who was the head of a loose confederation of Salish (Tulalip, Snoqualmie, Skykomish, Nasqually, etc…), scored himself a trip to San Francisco, and he got a peek at exactly how many of these white folks were about to descend upon him.
Being a far from stupid man (read the Point Elliott treaty sometime, and you can see what I mean), he returned home and immediately made friends with the white folks - and began marrying his daughters off to prosperous-looking white men. If you can’t beat 'em, join 'em.
In our branch, there were some ugly things that happened to my ancestress - she bore her white husband two daughters then split for Canada, after many beatings. The children were kindly raised by Phoebe Judson - a truly amazing woman. However, that meant our great-great grandma was separated from the First Nations community. None of us have married First Nations since, partially due to proximity (hard to marry one when you don’t know any), but mostly because it’s been tough to find a partner to our tastes that hasn’t been taken since birth - and jealously guarded to boot.
And yes, not so long ago, it seems - it was shameful to talk about First Nations ancestry as well. My grandparents on my fathers side still Will Not Talk about my great-great grandma Belle, who was supposedly Apache. However, there are no pictures of her, and very little in the family record about her, so I have been unable to confirm anything. As I said, they won’t talk about her. My paternal grandparents also do not want to talk about the fact that my mother is status - they didn’t want their precious son to marry That Woman anyways. According to them, they are Perfectly White, our ancestors were Perfectly White, in fact that side of the family is so Perfectly White I’m surprised they don’t glow in the dark.
I bet if they did the geneology research I did and came up with the same family of German Jews, they’d plotz. 
Oh yeah, my uncle Jerry is black Portugese - the Moors have an ancient history in Spain…