In other words, the US is little different towards its people than Zimbabwe. But in the case of the Native Americans, the USG is more concerned with killing people than looking after its own....but then the Indians are seen as an unfortunate obstacle to the mission - aren't they?
You probably don't know this (because the US education system is crap and the teaching of history is non-existent) but Indians were Federal property until 1936. In fact, little has changed since your ancestors gave them blankets infected with smallpox. Now the Indians are bombarded with advertising for cheap, strong booze and are given casinos as a sop for all the years of genocide (no, you wouldn't admit that the killing of thousands of native Americans qualifies as "genocide").
So as far as you and your brethren are concerned, all you have to do is either buy their ancestral lands or force them off them in some other way. Of course, running a smear campaign alongside any move to purchase said land is also welcomed by those (like you) who support the continued brutalisation of thsoe who don't conform to your idea of "American".