As tragic as the history of colonial conquest is, its legacy of inequity is alive and well today. We literally live in the aftermath. The nations of United States, Britain, Portugal, Spain, France, the Netherlands, Denmark, and Sweden all participated in the Trans-Atlantic Slave Trade. The nations of Europe all benefited from the past centuries of colonialism.
In West Africa during the time of colonialism not so long ago, people were slaughtered for standing against European interests and their possessions were outright stolen from them.
Klaue stated that vibranium was known to the people of Wakanda as "Isipho," meaning "the gift." If this was a "gift" to humanity, why was this gift to the world kept such a closely guarded secret from the world for so long? Could it be that Wakanda had already lost some of that precious mineral to the world at some point(s) in time?
Killmonger alludes to colonial era history when he says that the war hammer in the museum was "taken by British solders in Benin." This is real history. It was "submit or die" and the dead had no say in where those objects they made would be taken to show off as trophies of their surrender or annihilation.
Gonçalvez was sent by Prince Henry (a.k.a. "Henry the Navigator") on a mission to expand Portugal's war "under the banner of the Order [of Christ] against the said Moors and the other enemies of the faith" into "that land of Africa." Henry was curious to see just how far southward the influence of the Moors extended.