World Series

How is it that Major League Baseball can continue to call their championship series the 'World Series' and continually refer to it as a world-championship.

The World-Series does not represent a world championship, the National Hockey Legaue does not make that claim, neither does the National Basketball Association as far as I am aware.
Time for this to change, and the title attributed to the championship to change to reflect that it is merely the series to crown the champion of Major League Baseball.