we have scandinavians (nords) celtic French (bretons ) Romans (empire) and Africans (redguards)
It is oversimplifying
In Tamriel Men cultures are a mix of existing real world cultures+some fiction
Nords are based on scandinavians, but they also have a lot of slavic influence in them
Bretons are based on medieval central/western Europe nations
Imperials are based around Mediterranean sea cultures (including Egyptians and Hebrew)
Redguards have little of classical "african" in them, they are closer to arabs and caucasian highlanders
As usual it is only my opinion and I might be wrong