As America marks 250 years since its founding, CBS News asked Americans to weigh in on what they think stands out about the country.  Best thing about America When asked to pick the best thing about the American way of life, it's "the people" that comes out on top, far ahead of its land and resources, its economic system or its system of government. America's greatest invention We asked people to tell us in their own words what they think America's greatest invention has been. Freedom was the