[vicky_molokh]

Q: What Cultural Familarities (CFs) are there in the modern world?
A:

Originally Posted by Kromm

We have never published such a list, but behind the scenes, we use this one:

1. Latin American (Mexico and parts south)
2. Anglo (the U.K. and its English-speaking former colonies, including the U.S.A.)
3. Western European ( "the Continent")
4. Eastern European (the former Soviet Bloc)
5. North African (from the Mediterranean coast south to the Sahel)
6. Sub-Saharan (specifically as contrasted with North African)
7. West Asian (from the Mediterranean east to Iran)
8. Central Asian (Kazakhstan, Uzbekistan, Turkmenistan, Afghanistan, and so on)
9. South Asian (dominated by India)
10. East Asian (China, Japan, Korea, etc.)

Of those, I'd say you could afford to break up Latin American and South Asian further, and Sub-Saharan a lot further, if the campaign requires it. But if you want an even 10 to hit Cultural Adaptability on the head, this list works well enough.

You would almost certainly find "Colorless Green Ideas Sleep Furiously" (Pyramid #3/44: Alternate GURPS II) and "Speaking in Tongues" (Pyramid #3/54: Social Engineering) to be of value, then.

Update: An unofficial attempt to illustrate this split can be found here.