This is from a BBC video Tiny piece of US (see:1:50-1:55)
"But what of all this business about it being America?"
This sentence structure sounds confusing to me. I have thought that it may be a modified version of the common question structure (what is it all about?), which is used when people try to understand something deeply that they can't quite understand completely?
But then "what of....." does not seem to fit in that structure. So, this must be something different.
What is the structure of this question really? Can we break it down into pieces to understand it in a much clear way?