This one is easy. I’m American, therefore, it is from the perspective I know best. As an American, the story begins here, in America. When you start local, where the hell else would it be? In my career, I have worked with a number of nations and their military personnel. Right now, just from a “geo-logistical” standpoint, we have some of the finest equipment in the world for doing what is described in the book, as do many of our allies who have acquired much of their equipment from us. Still, everyone contributed as the picture expanded. (Russia has more artillery tubes, the Chinese forces have more ground forces and access to lead paint. In short, we all have something to bring to the table, and for the most part, we all did bring it.)
While we’re on this subject, I do not give short shrift to the Navy or the Air Force either. We fight together, train together, and have endured hardships around the world, all together! This is why the Navy and the Air Force are key players throughout the book(s). Granted, in the first book, the initial focus is more local, and therefore the Army is in a lead role, but I can assure you, as the series continues, there is a difference in perspective that will be even more inclusive of all involved. You don’t fight a global war without forces from around the globe, to include all of the Armies, Navies, and Air Forces.
In the first book, there is a paradigm shift, from the local (in America) and more tactical perspective, to a later global and more strategic campaign. The more global campaign by necessity includes other nations. This is a natural progression, but it must also take into account what is left, and where it is left, to allow for the unification of forces. You could literally write a book just on this type of relationship and what it takes to forge such a thing, but that was not my intent in these books. In the first book, you begin to see these relationships build on a smaller level until they lay the ground work for what is coming in the second book. In the first book, I tried to flavor it by referring to the resistence by the Argentine Government from allowing their forces to fall under the command of a General from the UK. (For those of you who remember the Falklands, this might have some meaning.)
As the book unfolds, you will also find staff officers and commanders from a number of nations. This is not an American Show, but if you’ve ever read a history of World War II, you will quickly realize that if the book is written by a General from England, then it will have an English bent, just as Patton’s memoirs are from his bent. I do know that for General Patrick, a closeness develops between himself and General Fuller, who is an officer from the UK. In the second book, you find that there are others, from other countries, that will forge equally solid bonds.
So, is it an American show? In part, yes it is, but no more than World War II was an American show, or an English show, or a Russian show.