It now features five teams from each of the three countries.
It features ten teams of two in a race around the world.
The show features teams of four children (around 11-16 years old).
The event featured only American teams for its first five years.
However, it was decided that the 2009-10 season will feature 16 teams.
Division One features two new teams in a league of 20.
In 1933, the league featured only six teams for the first time since 1923.
It will feature teams of two in a race around Canada.
And not since 1994 have the games featured teams that played each other in the regular season.
North America has only one professional division featuring just 19 teams for around 340 million people.