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Overview of the slave trade out of Africa (1500-1900)
(i.imgur.com)
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It has a secret city that's super advanced, but I'm not sure it's necessarily meant to be an alternate history where colonialism never occurred, but I could be wrong as well, haha
Doesn’t seem like it, Wakanda has had unlimited energy and advanced tech for years but none of the other African countries even knew about it much less the world.