To answer the title question: Yes, in the real world. Besides Chichen Itza I can't really think of any construction of african or native american origin that had the purpose or effect of the notable wonders of eurasian origin.
This has nothing to do with race as there are no races, only ethnicities. Those with wisdom can recognize that all humans are equal, and can, at this point in time, look back on any cultures achievemants and be proud to be a member of the human race.
Why do we hold such petty grudges? Your ancestor did such-and-such, and my ancestor did no such horrible thing.
The Eurasians developed 'civilization' (the proccess of breeding politicians and finding faster ways to kill others, plus science and healthcare and peace treaties and other positive things) While the first americans and africans lived off the bounty of abundant, recource rich land; with no real need for politics, science, or faster ways to kill one another.
Who wins? Who is the best?
The humans of course!
But we are all human...oh right, we are all human.
Civilization, the current dominant force (over religion) that controls humanity, was created mostly in europe and aisa. It is only natural that a game of CIvilizations should be centered on european and aisan achievements. That does not mean I think that africans/aborigionees/native americans are "uncivilized (you have to say it with an upturned nose in a brittish elite accent.)" Personally I would prefer to live without a civilization, to have all the things I need to survive abundant around me, to never have a concept of "class distinction" or "war." But as in the late game in CIV IV, the empires controll all the recources, and only the wealthiest 1% get to live how man dreams of living, how man is meant to live.
but lets despense with the philosophy for a moment, what is your agenda? Do you have a mod that you are working on, does it work? Does it add anything but more? What about balance? What about graphics, fun, flavor, and function? If there isn't a reason for the changes a mod would be a waste of effort. If there isn't going to be a mod let us engage in intellegent conversation/debate/flamewar.