First, who, exactly, were the "first Americans?"
Second, those who ignore or fight the progress of human culture are less civilized than those who push it forward, regardless of where they are. America, as we know it today, has drawn the best and brightest from all other cultures on Earth. That's why we are the most advanced, the most successful, the most "civilized" country around today. It's not the place, it's the culture. McDonalds and all, we are more forward looking than any other place on the planet. We got that way not by being insular and racist but by embracing and, frankly, stealing the best from all the other cultures there are.
Is American perfect? Not a chance. There are no perfect humans, therfore no perfect cultures. Are we better off, culturally, than any other group of people on the planet? Without question. Anyone who questions that is ignorant or in denial.