You're entirely correct in the fact that the US never wants to face up to, nor discuss, its own ugly past - they'd rather whitewash it all away - presenting a propagandist mythology about the nation for citizens to believe in rather than exposing its destructive history containing both the extermination of untold numbers of native individuals by European colonizers as too its slave loving past.
Where you err is grossly exaggerating the number of individuals affected. While there's no doubt hundreds of thousands of Apache, Cherokee, etc individuals were in fact exterminated by colonizers, others however, died as a result of smallpox, measles and other diseases being introduced onto the continent by previous exporers. During Columbus' days, indigeneous communities were approximated to be 60 million or so throughout the entirety of North, Central and South America yet a century later, those numbers had fallen to around 6 million.
Accordingly, it is highly erroneous to assert hundreds of millions of native Americans were exterminated due to a holocaust though it's completely true hundreds of thousands were.
