Interesting, I didn’t know that. So all World Series matchups in the expansion era, have included at least one of the original 16 franchises.
The Expos/Nationals franchise has never been to the world Series. Stay tuned to see if they make history.
The only teams which have never been in a World Series are the Mariners and the Nationals. The Nationals (formerly Expos) date back to 1969 and the Mariners to 1977.