When did baseball stop using the American & National balls?

[flightposite]

And go to just the Official ball.

 

[TramFan3]

The same time they got rid of the American League and National League offices and made it just Major League Baseball. I believe it was in the 90's. It was the work of Selig.

 

[Austin]

From Wikipedia:
"In 2000, Major League Baseball reorganized its structure to eliminate the position of League Presidents, and switched to one singular baseball for both leagues."
Link: http://en.wikipedia.org/wiki/Baseball_(ball)