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The phrase "The USA: one nation, many different people" means that in USA's origins lies so many conquerings and migrations that there is no sense in speaking about different people as long as the country consists of so many components. Nevertheless, all those different components obey the same ideas, therefore, make up one nation, no matter what religion do they profess or what skin color do they have. It's also a hint that USA is a democratic and open country without any prejudices towards people with different origins.