Some of what you posted I agree with, some I don't.
Yes back in the day there were many more "tribal adoptions" by non-Natives then there is today, however it is still practiced in rare cases. The most famous recent event, was the adoption, by a tribe of Obama.
However, modern concepts, including that of blood quantum as well as others that have been forced upon us makes that practice very perilous to our future survival as a distinct race as well as our culture as a whole, so is necessarily very rare today.
The fact that our ancestors were open to immigration by others has little to do with race and more to do with our belief that the Earth was created for everyone, and one does not own what was created and rightfully belongs to Creator.
Historically, territory disputes had to do with carrying capacity of a given location. Just as in modern times, a given location can only support a finite number of inhabitants without doing definite and severe damage to the region to the detriment to the Earth as well as all inhabitants.
The effects of this is very apparent all around us, today.
The idea was not that we owned the piece of ground we inhabited, we were simply, safe guarding its ability to sustain us for an indefinite period of time.
I have many non-Native friends who I consider relatives, and I welcome them to my home at any time they please.
I know many natives and in fact Nations, who frown upon "nons" participating in Ceremony.
As a rule, I have no problem with nons participating in most Ceremony, based upon whether they "come in a good way" etc.
That said, there are some ceremony that is closed to outsiders, and there are in fact some in each tribe that are exclusive to only certain members of that tribe, medicine persons or Spiritual advisers for instance. I fully support these restrictions.
Your promotion of forced assimilation is a very old tired worn out concept that is totally immoral, and very superioristic in its concept, and application.
It is one that has been attempted with varying degrees of success for over 500 years now, and one that most of us simply will not endorse nor submit to.
And why should we?
We are not so self absorbed and feel so supreme that we demand that everyone be like us.
Everyone no matter their race, religion or most any other preference they may have have the right to embrace those personal ways so long as they do not cause damage to others.
The concept of assimilation not only damages cultures but in fact destroys them over time.
The fact that there have been separate Nations, tribes, communities etc for all time has not, in and of itself, infringed upon anyone elses ability to be themselves.
It does however, promote diversity and compliments the the Nation as whole in many ways and should be encouraged, not forced out of existence.
Your truth may not necessarily be my truth, your heros may not be my heros, and most definitely some of your traditions and celebrations are not something we would celebrate.
Forced assimilation, is a very supreamacist concept and totally unacceptable.
If your ways work for you, great, I am very happy you are comfortable with them and encourage you to practice those ways exclusively, however, your ways don't fulfill many and should not be forced upon them.
As for your theory of Asians coming here 10,000 years before whites, therefor we must be descended from them, doesn't wash......that would be what.....16,000 years ago or so?
Sorry.......
http://www.thefreelibrary.com/The+40,000+year-old+American+pioneers-a0133777588And even this proves nothing to me concerning who came first, the vast majority of our history has been passed down orally, and a great deal of it has been scientifically authenticated.
We have our creation stories that very from Nation to Nation, and the one from my own People clearly describes how we came to be on Turtle Island, and that is my truth.
Feel free to embrace your own truth, and you are welcome to present it to myself and my Peoples, just please, do not try to force us into embracing it ourselves to the exclusion of out own traditions.