no, clearly any number of PODs could of kept the UK strong or made the US weak (or at lest weaker than other powers) the US has some things going for it, its the largest mostly white of British stock English speaking nation on Earth, Canada sharing the largest border on Earth with the US makes it likely it ends up in the US orbit, but if the US never goes all Imperialist in 1898 it never ends up in the Pacific, thus Australia and New Zealand never look to the US, maybe they turn to each other and other Neighbors, or maybe to Japan or China in a post British Empire world, or maybe if the US never rises at all the Commonwealth stays knitted together as trading partners.