When commissioner Rob Manfred pointed out that Major League Baseball expansion could also mean realigning the divisions and conferences, the baseball world had itself a tizzy, speculating that it would ruin decades-long rivalries, among other traditions of America’s Pastime.

MLB Commissioner Rob Manfred has said that when the league expands to 32 teams, regional realignment would occur. Here’s why and how it might look.

That’s news when the commissioner says it publicly, but impending realignment has not been a closely guarded secret. Expanding to 32 clubs would necessitate some reshuffling, the most likely of which would be moving to eight divisions of four teams apiece.