Also of note.... Boston and St. Louis are the only cities/markets that have played for the championship in the four major US sports.
I'm unclear on this statement.
Not that this is new, but
The Blues and Bruins will (and, in 1970, did) play in the SCF.
On three occasions in the late 50s and early 60s, the Boston Celtics and St. Louis Hawks played in the NBA Finals.
The New England Patriots and St. Louis Rams competed in Super Bowl 36.
The Boston Red Sox and St. Louis Cardinals competed in the World Series in 1967 and 2013.
Apparently, no other pair of cities/markets has competed in all four major U.S. sports finals. Los Angeles and New York have competed in all but the NFL