This is such a comically ignorant view. Most countries in the world have a similar history as the US. It's like you dingleberries think the US is the only country in history with slavery or conquest. This view shows that you have a myopic view of history.
Every single country in the New World is a product of European colonization, slavery, and erasure of Indigenous people. This is true from Canada all the down to Chile. In fact, this is actually more true in other countries because the US was a small part of the Atlantic slave trade and the Spanish and Portuguese empires made killing natives their favorite past time.
It's not just the new world, but this also applies to the old world. Countries like Turkey, Russia, Azerbaijan, South Africa, Zambia, Zimbabwe, Morocco, Australia, New Zealand, and the list goes on and on were had similar histories.
The reality is that this just how nation building is. Nations don't spring up out nowhere and magically gain land and sovereignty. Nations are built through conquest, hardships, exclusive sense of pride, and cultural homogeneity over time.