Rather than bow to stereotypes and portray Wakanda as an impoverished, war-torn African nation, Marvel did something pretty cool: made it a super-advanced utopia ruled by a superhero.
It's just too bad that this utopia's mere existence would doom millions of people to death and misery. Allow us to elaborate ...
They Keep World-Changing Technology To Themselves (At The Expense Of The Rest Of Humanity)
What sets Wakanda apart from other African countries is that they literally set themselves apart from other African countries, and everyone else for that matter. Notoriously isolationist, Wakanda has used technological superiority and a militaristic culture to fend off any invaders and completely close off its borders. In fact, the events of Civil War were kicked off during one of Wakanda's first attempts to send delegates to treat with foreign nations -- in the year 2016.
So their borders are impenetrable, and they simply don't give a shit what happens on the other side. If it wasn't for all the black people, it would be Donald Trump's wet dream.