Pro Baseball: New York Yankees.
Pro Basketball: Los Angeles Lakers.
Pro Football: Dallas Cowboys.
The Dallas Cowboys organization eclipses all other sports franchises by 5 times, due to merchandise sales/rights, team endorsed products/services, the team notoriety/fan base, the facility complex, and a seperate source of mega-income from the DC Cheerleader Association. Ironically, the cheerleaders receive approximately 100.00 per week as their entire salary! (Simply because of the individual opportunities each one is overwhelmed with.)
The question says in "North America" which is a continent and includes Canada. Therefore, not necessarily in this order, but we should include: Montreal Canadiens and Edmonton Oilers along with the Celtics.
American football
very nice
boxing.
football
New York teams sell a lot but overall, The Dallas Cowboys sell the most merchandise out of any sports team
Soccer, Tennis, Hockey,
The Greeen Bay Packers.
slapshot the hangover and diary of a wimpy kid
Forbes Listed the Manchester United as the richest sports team in 2009, Dallas Cowboys were second.
It is MMA. Mixed Martial Arts has been growing a lot.
The Houston Texans and the Charlotte Bobcats.
as of 2011 in north America, the highest is boxing, followed by formula one racing and third is baseball because the three sports listed above has the highest possibility of fatalities.