Argentines
Benin/Dahomey
Benin/Nigeria
Berbers/Tuareg
Bulgarians/Romanians/Other Balkans
Canadians
Creek/Muskogee/Other SE NA
Cubans/Haitians/Other Caribbean
Etruscans
Gauls/Britons
Georgians
Gran Colombia/Other Colonial SA
Haida/Tlingit/Other PNW NA
Irish/Scottish
Kushans/Bactrians
Lydians/Pontus/Other Anatolians
Maori/Other Polynesians
Minoans/Mycenaeans
Nepalese
Timurids/Khazars/Other Central Asia
This is, for me, a little bit oversimplified and mashed up. Some of civs are on the same slot while the only thing they have in common is geographical proximity and totally elude historical and cultural differences.
More precisely, romanians are not in the Balkans but in the Carpates, they're language is a roman one while Bulgarian is slavic, and they descend from dacians while bulgarians from the Bulgars, from central Asia. I'd prefer to see that slot divided into three : Romania, Bulgary and Serbia, which had a powerful empire under the Dusans and is the best representative for the Balkans.
Same goes for cubans and haitians. Cubans started their independance movement in the momentum given by the liberation wars in Latin America, and is 90% inhabitated by white creoles or mixed descent, Haiti started their revolution out of frustration of the french hard colonial rule, which makes the only succeded slave rebellion, and making the island inhabitated mostly by african descent people. So I'd rather have these two also separated.
Irish and scottish is also a bit cringy, but you're far more expert than me on the british isles history, so I'll leave it under you're appreceation.
Finally, Timurids and Khazars only have their geographical proximity in common, because in culture, time, warfare and diplomatic relation, they have nothing in common. I wouldn't like Timur because he just reenacted the arabo-mongol rule, and his empire was simply too short lived. Khazaria, on the other hand, lasted for some centuries before its collapse, and wasthe only «jewish» empire outside Israel at some point and was on par with the Byzantine empire during its height.
In the end, I'd rather have a third thread more precise and thoughtful, than only a second too much mashed up.