How Did Cracker Jack Become Synonymous with Baseball? – The earliest evidence of Cracker Jack being sold at a ballgame is in 1896, says Wiles.
It was shown in an ad on a scorecard for a game hosted by the Atlantic City Base Ball Club against the Cuban Giants. Cracker Jack was first sold at a Major League ballpark in 1907. So it already had a presence at games, and Norworth cemented that by including it in his song
Read it all HERE