Not at all...it wasn't "their land" any more than it was the tribes lands that they conquered and stole from. No country anywhere in the world just existed out of nowhere.
A people or race or ethnic group conquered or settled every single country on Earth, and either defended it, created a working functioning government, or were conquered into oblivion.
But the United States DID become an actual country, recognized by every government on Earth and the Founders helped make the greatest and most powerful country there is.
The government does have checks and balances, its up to the people to use their votes to shape it how they want