Just to be clear, I am only referring to the Marvel Comics Universe, not the Marvel Cinematic Universe. I feel Coates his been doing a hatchet job on Wakanda since he started.
What Ezyo said is true regarding Wakanda's involvement with combating white supremacy. Hudlin does a good job addressing it in the 1st BP annual. It would be a complicated thing for Wakanda to take on the whole world to combat colonization, please see the annual. Actually, in the annual Hudlin says that Wakanda could have possibly lost the war.