The land of the free. Fact or meaningless rhetoric?

[kılıç_mehmet]

having multitudes of people together in a country with different languages and cultures you say? in a single country you say? this has never occured before...except in most countries in the modern world.

Which one, say?
I know only a few. Belgium, Russia and China. The US seems to have bent on actually eliminating the differences in terms of culture, as none of the current inhabitants are really the original inhabitants, it's easy to leave their original culture behind.
The rest are mostly nation states.