Originally Posted by DumpJerry
The Yankees Cardinals are heavily responsible for this.
As well as the White Sox. If the White Sox hadn't beaten the Angels in the 2005 ALCS, there would have been a World Series between two 1960s expansion teams because the Cardinals didn't beat the Astros.
The Yankees, of course, beat the Mariners in 2001 to prevent a World Series between two later expansion teams. Beyond those two, I would have to look things up.
Expansion teams started appearing in the World Series in 1969, and now there are 14 expansion franchises to go along with the 16 pre-1960 franchises. It's odd that expansion franchises haven't met in a World Series.