Shouldn't this country have a national holiday in honor of its original natives?

The original American natives who populated America should be honored as the true people of this country and we should be ashamed of "the white man's takeover". We celebrate Columbus Day which is a complete sham. How do you discover a country that is already inhabited? We celebrate Thanksgiving Day which is really a slap in the face to native Americans. It's nothing more than a prelude to their demise. We have a real evil way of making us the good guys through out history when in fact we should be feeling a lot more shame.