Keystone State on top

It only just occurred to me that three of the four major team sports champions in America currently reside in Pennsylvania: the Steelers, Phillies, and Penguins. The 76ers remain the odd team out there, with the Eagles, Pirates, and Flyers granted a pass. I'm sure this has been the subject of several thousand columns already, but it is kinda cool. I wonder when (if ever?) they have all been in the same state. It looked likely they might all be in Massachusetts, not so very long ago...