Robo Call?
I have been pondering this same idea anon. The Ibor rules underwent some big changes in 2018 and Ibor might be replaced by something else entirely in the US.
Sauce >https://www.ey.com/en_gl/banking-capital-markets/ten-things-you-need-to-know-about-the-ibor-transition
District Map
I thought I looked this up last year, the only reason that I was aware. Agreed, it does not make a lot of sense (why there isn't a Southern District, etc..)
o7