In the end, and let's not forget this, they have to sell the game. Not including countries like the United States, the U.K. or Germany would be unthinkable because of the number of customers 2K has there. Which makes it even more amazing that they didn't put Spain in.
Yes, this is the only reason to include the US, the game isn't about what Civilisation is best from 1800-2000, its about a much bigger scale and the US hasn't done all that much in comparisson. You can detail the things it has done to change the world, but all Civ's have done similar things to change their world at the time, the US is merely a recent Civ to do it, that alone does not merit thier inclusion, but the fact that a lot of people are customers to buy the game simply because they are alive today and not living in Rome in 2000BC is why they will be included.
You have to put things into perspective, if the Romans were around today, would the US still be the worlds economic power, or would it have been the Romans who colonised the new world and ruled with an Iron fist (not the tempremental fist of britain, "oh you've rebelled have you, nevermind then, cup of tea?") still controlling it today and probably burned China & everyone else to ashes by now for a conquest victory. The US may not of ever existed had history not taken place as it had, you have to judge the civ's based on the world they existed in, is the US massively dominant over everyone else to the extent that August Ceaser of the Romans was, or Alexander of the Greeks was. It's really a hard question to quantify, but I refuse to agree with people who say it definitely should be in the game "because we invented the internet, enough said". Does the ancient civlization "9500–6500 BC: Aceramic Neolithic" sometime around then, deserve to be in Civ purely because they invented the first wheel ever to be invented, its comparable to simply inventing the internet. If we included every civ based on discovering something great, then every single civ to exist would be in the game. No, we are going by Civ's that truely were dominant in their world. Does the US dominate the world, no not really.
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The US has some influence, sure, but my point is that its not as much as the Romans had on their world, is their another 17 Civ's through the history of human kind that have had more influence than the US on their world, almost certainly, and then by these merits alone as this is what you argue, shouldn't they be included in the game in place of the US.
Please stop saying "the Iqourous shouldn't be in the game, the US has had more influence" we are talking about the US here, and their right to be in the game, I can't say I know much about the Iqourous, perhaps they don't deserve to be in the game, but they do deserve their own thread to discuss it, we are not asking to replace the US with the Iqourous. But asking is their no other Civilization that has had more influence on their world than the US.