I believe it's the Dallas Cowboys. That's why they are called America's Team!
It's debatable and it depends on where you live. People in Pittsburgh would probably like the Steelers. People in Dallas like the Cowboys.
The Green Bay Packers is one of the most popular teams in American football.
At The Moment The Most Popular Football Team In The World Is Manchester United
Most popular team sports around the world are: Football (Soccer), Hockey ("Field"), American Football, Ice Hockey, Roller Hockey, Lacrosse, Rugby. The First 2 i mentioned are the top two popular and most participated team sports in the world
arsenal
football
National Football Team of Bulgaria
houston
Guatemala national football team
Manchester United have the largest fanbase in England and the world therefore being the most popular.
The most popular team sports in the United States are those comprising of American football and baseball. The National Football League is a very popular and highly profitable league. NCAA college football is also another popular team sport-based league in the U.S. American football is also played at the grade school level as well. Major League Baseball is dubbed "America's pastime". At the local and school level, soccer is also a popular team sport, although it is not as popular at the professional level.
Soccer, Brazil's football team.
Soccer / football in europe