What is ironic about the difference between the way blacks could speak in the north as opposed to the south?

IM would have one way of speaking in the north and another in the south
would please all white people in both areas
says if Dr Bledsoe could do it, so could i

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict