While survival time is important imo in determining who deserves to be in and who not (HRE ~1000 years) some these poll choices are a bit silly...why would Spain ever be left out of Civ? Also I am as an American a little peeved at some of the comments...America is on it's way out?

We may not be the #1 power for all time but we aren't just going to disappear or become something different from Americans/USA. Imagine all the complaint threads you would see if Civilization V came out and there was no American civ? Seems to me that maybe some are just unhappy with the fact that USA has demonstrated the realistic future of the world: diverse populations and countries not defined by race or language but human spirit. Despite some of the terrible propaganda in this thread, America despite it's
shortcomings,
is one of the most diverse/free countries with people from every other country on earth in the mix.
Really these posts about nazism and death are just unproductive and plain foolish. The Third Reich should not be implemented if this has been brought up because it is a minuscule fraction of German history, same goes for Soviet Union as you don't want USSR or Nazis fighting old German/Russian empires etc. They are too modern/short lived to fit outside of historical period scenarios.
The problem is not too many civs, it's too few. What is needed is POLAND for one! Poland in her various forms was actually quite large at one point (Polish–Lithuanian Commonwealth, even after Polish-Soviet war) and this justifies the ahistorical possibility of them growing larger, an important factor imo in choosing included empires.
After Poland some minors that should have been/in the future be included are Kingdom of Sweden, Kingdom of Denmark (was quite large once, if Mali is in why not Denmark), and maybe Austria/Austro-Hungary...and/or Hungary alone!
@Eweeze, Ammar and others: Your American bashing (there are no other words for it) are unjustified. If someone says something ignorant it doesn't make all their countrymen ignorant. Saying Americans feel like that is complete bunk, America is a unique entity in history and we have much to be proud of even in a short time span of ~230 years. This does
not overshadow the lengthy, rich histories of most other countries (US has rich history too, research it) so what we should really be doing is getting along here as gamers/history buffs instead of having a nationalist pissing contest.
@Eweeze specifically: Why don't you turn off the lights in your room, sit there with your eyes shut and envision a plane in the air...then a large silhouette drops from the bottom and a brilliant flash...a massive cloud. Now zoom in to the ground where the shock wave is spreading and the dust is rising...can you envision a mother holding the hand of her child being vaporized and turned to bone, then dust? Why don't you think about what you write before writing it, think about the actuality of your thoughts. You throw around nuclear destruction like it's just good payback or something. It's really a sick thing to wish on people from any perspective.