Perhaps I oversimplify when I leave out commonwealth and immigrants and all the other semantics that can be tied to the phrase and suggest that "out of many, one" is what e pluribus unum means, simply a synonym for United. The phrase can be used to describe many things but I think it really has only one meaning.
And I like thinking of the United States as cheese - as it requires disparate ingredients, some messy decay to be worthwhile, and becomes more interesting with age.
_________________________ A well reasoned argument is like a diamond: impervious to corruption and crystal clear - and infinitely rarer.
Here, as elsewhere, people are outraged at what feels like a rigged game -- an economy that won't respond, a democracy that won't listen, and a financial sector that holds all the cards. - Robert Reich