Yes, well there isn't any playmobil in Iraq or Afghanistan as far as I know. It is in the US and Europe, and apparently from what some of our European PFs have said, in both the US and Europe, the confederate flag is often considered a symbol of racial hatred.
I understand your point that it makes sense to have both sides of the war depicted. How can you possibly make a civil war dio, or any war dio, without soldiers from both sides? But even though the war was really fought over was the matter of whether the US was to be a loose confederation of states that made their own laws, or one united country under one government, the issue foremost in peoples minds then and especially now looking back on it was and is slavery, and that may be the issue that makes Geobra steer clear of the subject, and have cavalry fighting Indians instead.
Now, if you are not personally offended by any of this, why do you bring it up?