Why has wakanda gone through such lengths to remain hidden (and keep this resource hidden) from the rest of the world ?

But in modern times, as we see, Wakanda is a thriving, flourishing civilization with few conflicts with the outside world. So the primary function of challenge day is keeping the peace internally, with making sure the Black Panther is a fit protector now a secondary outcome. And there for it was kept a hidden for a while.

a molly pitcher

b martha washington

c betsy ross