In human kind's history European/Western culture surely is just a side step. However, in the light of the modern world, Western culture is dominating. As this game is released today, it is normal that it represents actual Zeitgeist (I just had to include a German word...

).
In these days (and surely in the next decades) Western culture is going to dominate world's history. What happens in, let's say 40 years is not known yet. Maybe a chinese produced Civilization franchise will have a different emphasis...
However, even if you consider the short period of time where Western culture had an influence on world's history, it will always be considered as a major influence factor, just because it happened during a time period, where progress was being made in a very fast pace...