yes NFL NBA MLB MLS
Two teams have switched leagues. The Milwaukee Brewers changed from the AL to the NL in 1998 and the Houston Astros moved to the AL in 2013.
A list can be found by clicking on the link below. There are no major professional sports leagues in Virginia.
There are 926 futbol teams in Spain. These teams are comprised of 5 different leagues, La Liga, Segunda, Segunda B, tercera, & Regional's. The number of teams grows to several thousands if you start to factor youth divisions and senior leagues. However, the 5 leagues I listed are really the only ones considered professional leagues as they are paid to play.
There are many soccer teams that are local leagues, but there is one professional soccer team, Real Salt Lake.
There are hundreds literally. These are broken down in to countries, genders, leagues professional leagues armature, University, School, etc
soccer is the sports that has most pro leagues. It even has a World cup.
It's almost the same: both countries have professional and minor soccer leagues with 20+ professional teams.
The most popular hockey jersey colors worn by professional teams are black, white, and blue. These colors are commonly used by many teams across different leagues.
There is only one league of professional basketball, and that is the NBA. The top teams as of the 2008-2009 season are the Celtics, the Magic, and the Cavaliers.
30 teams
There are about 4.5 million players registered with over 18,000 teams, leagues, and unions (junior, senior, and professional).
Association of Professional Football Leagues was created in 1946.