I've noted down the following wonders for NA:
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so yeah, it can definitely be done, and Inuit => Haida => Tlingit can definitely work as a line. (Haven't researched the Salish.)
Southern Africa is still bad though. Bantu and Shona/Zimbabwe can be added, they have a potential wonder each. But the Modern Civ is still difficult. You can potentially do Mandela's birthplace (Qunu) for Xhosa and the Bulawayo Kraal for Zulu but both of those are questionable in terms of Wonder status. The monument that could pass the most as a Modern Wonder for the Zulu or Xhosa is
Maropeng, the visitor's centre to the Cradle of Humankind, but that structure was opened in 2005, which is too recent.
Most South-African structures are out of the question anyway. The Voortrekker Monument (a viable Modern Wonder) cannot be assigned to the Zulu, that makes no sense whatsoever. You'd have to call the Civ 'South Africa'.
The rest of Africa is fine if you just go by the rest of the World Heritage Sites.