Not sure I share that viewpoint for the US, the history of the indigenous is the story of the people, not the nation.
And the US has many more populations that have great history, from EU and Africa.
But the beginning of its history is founded on the gathering and interaction of all those different cultures.
So for me saying the country is young doesn’t quite have the same connotations of erasure from colonialist, it mostly makes me think of how current the melting pot of all those different cultures are.
I still agree we shouldn’t diminish the importance of indigenous people in it.