Motocross Championship was created in 1994.
Motocross Madness happened in 1998.
Motocross Maniacs happened in 1989.
Motocross - video game - happened in 1983.
The prime product developed by Moto Games is motocross video games including Motocross World Championship, Motocross Madness, Freestyle Motocross and X Games.
Champion by Grinspoon
There are many large prizes that a pro motocross racer can win each year. The most notable are the X-Games event gold medals and the AMA Motocross Championship.
george roeder from Ohio
The AMA was founded in 1924 but the first AMA professional motocross race did not happen until 1969.
Ricky Carmichael is the GOAT (Greatest of all Time) when it comes to motocross. He is the current record holder of the most championship titles throughout a racing career.
80 - Jean-S. Roy - CANADA
Championship Manager happened in 1992.
Championship Sprint happened in 1986.
Championship Baseball happened in 1986.
Championship Rally happened in 1992.
Unreal Championship happened in 2002.
Championship Pool happened in 1993.
Championship Pony happened in 2008.
Championship Hockey happened in 1992.
Championship Bowling happened in 1989.
The link below is as close as I can find, it is not a complete list though.
1845 by One Minute Silence
Blair Morgan, a multiple time winner of the Canadian Motocross Championship, was born on October 8, 1975. He is currently 37 years old, which quite a lot for a motocross racer.
Rally Championship Xtreme happened in 2001.