Originally, Marvel wanted Wakandans to have British accents but Chadwick Boseman was not having it.
Boseman was a guest on THR's Awards Chatter Podcast, and discussed his role as Black Panther over the course of the interview. One thing he revealed was the studio's desire for him to speak in a British accent and how he fought against it.
"They felt that it was maybe too much for an audience to take. I felt the exact opposite — like, if I speak with a British accent, what's gonna happen when I go home? It felt to me like a deal-breaker. I was like, 'No, this is such an important factor that if we lose this right now, what else are we gonna throw away for the sake of making people feel comfortable?"