Context: Several MLB teams used to play regular exhibition games during the year against nearby teams in the other major league, but regular-season interleague play has made such games unnecessary. The two Canadian MLB teams, the Toronto Blue Jays of the American League and the Montreal Expos of the National League, met annually to play the Pearson Cup exhibition game; this tradition ended when the Expos moved to Washington DC for the 2005 season. Similarly, the New York Yankees played in the Mayor's Trophy Game against various local rivals from 1946 to 1983.

Question: What development has made it unnecessary for MLB teams to play exhibition games with teams from other leagues?
Answer: regular-season interleague play

Question: What league are the Toronto Bluejays in?
Answer: American League

Question: What league are the Montreal Expos in?
Answer: National League

Question: What game do the Bluejays play against the Expos?
Answer: the Pearson Cup

Question: When did the Mayor's Trophy Game end?
Answer: 1983

Question: What has eight regular-season interleague play unnecessary
Answer: Unanswerable

Question: What other Canadian team did the National League Toronto Blue Jays play? 
Answer: Unanswerable

Question: Which Canadian teams played in the Mayor's Trophy Game
Answer: Unanswerable

Question: What major league New York team played for the piercing cup?
Answer: Unanswerable