America's a good example of effective multiculturalism.
Nobody tells these hicks here that they can't drink their iced tea, their language is distinct from the rest of the country, as is their cuisine and their culture on a variety of levels, such as the traditional Southern contempt for labor unions. New York and LA are not the same city, Chicago is totally different from Austin is totally different from Dallas is totally different from Portland.
BUT they do share substantial cultural commonalities enough to be considered the "homogeneous" American culture and to be able to discuss things with one another through the use of shared cultural landmarks. Multiculturalism is a good thing, Sarkozy's a douche, and also he's just looking for noble sounding arguments to justify his various usurpations of the rights of the (second and third generation) descendants of Algerian Frenchmen who immigrated to France, particularly those who practice Islam.