American History and United Nations

In Whitehead's system, Process is a Concrescence of a novel entity that incorporates each already existing Real entity, upon the completion of which, the novelty joins the rest in a new Reality.  The United States can be conceived as an instance of that pattern--a confluence of all extant nations that, upon completion, yields a new totality of nations, in which it is included, i. e. the United Nations.  On this interpretation, the U. N. is an essential factor in American History, not just another alliance into which it contingently enters.  Conversely, if there is a respect in which the U. S. is, as some assert, "exceptional", it may be its unique relation to the United Nations.