I ment that Byzantines and The Holy Roman Empire is remenants of the Roman Empire... which divided into east and west Roman. Its ironical to bring civilizations that belongs in the same culture/people tree into the game. I think they should have civilizations choosed with the right time they formed. If you stard at 4000 BC then Egypt, Persia, Aztecs, Zulu...
The Americans will the show up during the renaissance age... England, France during the dark ages... and so forth.
It was wrong to bring up the thing about the ironclad unit here (my first time ever to write about CIV in any forum, so i have had the issue since CIV 1).
Its just that i havent heard any famous battle taking place with ironclads in it... if any have any tip of where i can find historical documents or books to this subject ? (the steam engine it had, and the heavy weight of the "ship" made it quite useless in navies and world threat, it was not until the development of and engine that such ships/vessels could be usefull... therfore i think the ironclad is obsolete, as goes for the famous artillery unit "big bertha" which was a train artillery... try to deploy that in the far east
)
First, on navies: reading about the evolution of navies from the wooden ships powered by sail to modern oil-powered and nuclear ships (still a relative minority) is fascinating. There were dozens of weird ship classes created, especially in the 1870's-1890's where they were still figuring out how to build metal ships with coal-powered steam engines...and then the evolution to oil-powered ships created an entirely new genre of ships. The name "ironclad" is an American term, granted, but several European navies had oddball ship classes like ironclads or weird mixed ships as well. I don't have access to my library at the minute, but take a look at Wikipedia to get started. Then find a real source.
However, I believe you are incorrect on the HRE. The Western Roman Empire collapsed in the most complete manner, and did not exist for several centuries until the HRE came into existence. The HRE was originally just a figurative title, the "Holy Roman Emperor", which was bestowed by the Pope upon a powerful European Christian monarch. It was more of an honorific that marked that particular kingdom as the heirs of Rome, and was intended as a signal that they were the leaders of Europe. For a brief while, under men like Barbarossa, it had a stronger and more centralized administration, but that inevitably for some reason or another didn't work. It eventually transformed into a complicated system where a few electors of the greatest of the myriad of German states would elect an emperor, typically an Austrian, to officially lead the Germans when they were a confused bunch of independent states. Of course, this incredibly oversimplified story doesn't even mention the weird role of Prussia or all the bizarre politics...and how the system didn't work.
The HRE was an odd thing, and changed throughout the centuries. No single paragraph like the one I wrote above can be a complete description of them, and I know there could be a dozen people right after me that post "hey, but what about these factors and those effects and how this particular system worked?" on the HRE. The one thing it wasn't, though, was a direct descendant of the Romans. They were Roman in name only, a title bestowed by the Pope.
On the US, they are the only post-colonial state I would consider adding. However, I tend to focus on more ancient history and not the modern era (as you may notice from several of my other posts and rants), so if I had to pick leaders, I would probably select Washington and Lincoln. If I had to pick a third, T. Roosevelt, no more recent than that. I typically object to 20th century leaders, but America has to be an exception due to its shorter history.
That being said, if I could have more ancient Civs like the Hittites, I would be willing to sacrifice post-colonial Civs. However, I would first want the HRE transformed into Austria, and that foolish "Native American Empire" to be obliterated. Long story short, there's too many factors to say definitively.