Most of baseball comes from Brooklyn.
After its creation by gentlemen in Madison Square Park, baseball changed fundamentally in Brooklyn, where the players were rarely gentlemen. There the game became a rousing contest with the object no longer to socialize but to win. This meant exploiting opponents' weaknesses, leading to the bunt and the stolen base, to the fastball, change-up and curve, to the first paid players and to the first (surreptitiously) professional teams.
This is not to mention the essential contribution of Brookln's team to the nation in 1947.
In its rules and in its most compelling history, baseball is Brooklyn.