Why did the King of Wakanda build a WALL to keep out other races?

It's about nationality not races. But discussing isolationism as an idea is kind of the point of the character.

>>93127314
you know he didn't build the wall, right? the thing is thousands of years old. the whole point of BP is he wants Wakanda to help out more but ever baby step he takes towards that causes a bunch of his people to turn on him out of fear of change

We already have a thread about that >>93122908
Let me guess, you saw that pic on a different board (/tv/ or /pol/) and got curious?
The simple answer is that they're isolationist and xenophobic.
They view everyone else regardless of race as mongrels.
That's part of the conflict in Black Panther stories done right