Erik Stevens, born N’Jadaka, was the son of Wakandan Prince N’Jobu and an unknown American woman. The latter was wrongfully incarcerated and died in prison. Although he raised his son in Oakland, California, Stevens’ father nevertheless promised the young boy that he would one day take him to Wakanda, claiming that the sunsets there were the most beautiful in the world.

https://marvelcinematicuniverse.fandom.com/wiki/Erik_Killmonger