Arsenal FC since 1919 and Everton since 1954 are the two longest serving teams in the top league of English Football.
The Canadian Football League has eight teams. A ninth franchise has been awarded to Ottawa, but the team has not been created yet.
Since 1933, they are one of the first teams in the American Football League.
Liverpool F.C. is a football team located in Liverpool, England. They currently play in the English Premier League. Historically, Liverpool have been one of the most successful English teams, though they have not won a title in the Premier League era.
There are a great number of teams that have never been in the top flight. English football has over 140 leagues from which teams can (in theory) rise all the way to the top level.
arsenal,man united, chelsea, liverpool and newcastle united
"Manchester United is the only team I know that has never been out of the prem" That answer is incorrect, the only team never to have been relelgated out of the "TOP" league in English Football is Arsenal. Manchester United have only been in the top flight since relegation for 36 years.
Several Premier League teams have played close-season friendly games in the USA. Although there has been some talk of playing competitive league games in America, this has not been approved by the teams/EPL.
All teams that have won the Super Bowl have become world champions. Since the 1970 merger of the National Football League and the American Football League, the Super Bowl winners have been considered NFL champions.
The Birmingham City Football Club, a Football League Championship team, have been playing in Birmingham since the team was knows as the Small Health Alliance in 1875.