Updated: Oct 11, 2021
Motocross is a niche sport that became popular in america in the 1970's..
The sport spread like wildfire after being introduced to America by Belgium
Edison Dye after he had a vision to sell husqvarna motocross bikes in the USA, he brought over Lars Larson, Torsten Hallman, and Roger Decoster to show the USA the way it was done there..
When they first came to America they were literally travelling to different states and towns to show the sport to people, helping them make tracks, and going to radio stations to explain motocross to people.
Then the movie On Any Sunday came out, it was a big Hit in theatre's and is widely credited to have helped The sport of motocross and all forms of dirt biking grow all over the country.