What exactly constitutes a "Tribe", if not a group of people related by genetic inheritance?
What binds the Government's agreements - however old - with the "Tribal Government" to which you refer, and thereby to an individual as a member of a "Tribe", other than that person's genetic makeup or blood relationship to other members of the "Tribe"?
A lawyer can pick these things apart... and if today's European "invaders" are in fact linked by blood relationship to today's American Indians, as a result of ancient migrations from Europe, it drives a wedge - to the extent that legal claims to entitlement are based on blood relationships - into the the argument that only today's "Tribes" are entitled to the portion of your paycheck that the US Government is handing over to them.
(For what it's worth, I didn't invent these arguments; I read them somewhere, and have *no* recollection of where...).
If you would take the time to study the origins of Hitler's "Rassenpolitik", and of the mission of Himmler's "Office or Race and Resettlement", you would find that discrimination by birth and by by race, and the equating of race with culture and predestination, is one of the foundations of Nazi philosophy, and is advocated and practiced in nearly identical form by today's Lieberals - all in the name of "equality" and "justice", of course.
Ummm... When they talk about Kennewick Man possibly being "European" (which is most likely not even accurate in any way - most believe him to be of asian heritage in some manner) they mean PREHISTORIC - meaning he would have absolutely ZERO linkage with those who came here post-Columbus... But, you get an A for effort in muddying the waters ;0)
Now, also keep in mind that the government does NOT take money from our paychecks and turn it over to the indians, but you can keep believing that if it helps you to sleep at night... Probably 90% of the money tribes get "from the government" comes actually from businesses who lease indian land, and pay royalties to the tribes for natural resources etc... However, the businesses pay the money to the government, who then doles it out (and skim billions off the top first) because we indians are too stupid to manage our own money and our own business affairs, apparently... Some money is spent on federally-run schools and federally-run health care, but both are mismanaged and basically a joke - bit then, the government does the same thing in other economically-depressed areas, regardless of race...
I suggest (and I mean this in the nicest way possible) that you actually research the facts about Indians BEFOE talking about them. It helps alot. :0)