The most recent team would be 2011/12 Green Bay Packers
The Vikings joined the NFL as an expansion team in 1961.
Who was the most penalized nfl team in 2013
Yes.
The American Football League (AFL) merged with the (NFL) after Super Bowl III in 1969. The most recent team to join the AFL was the Cincinnati Bengals in 1968. The American Football Conference (AFC) makes up half of the NFL, the other half being the National Football Conference (NFC). The most recent team to join the AFC was the Houston Texans in 2002.
Most cities of the world do not have a NFL team
A team's name, uniform, and logo are registered trademarks of the team itself. The NFL, obviously, must give their approval to the logo. In the case of the Houston Texans, the most recent expansion team, the NFL actively participated with owner Robert McNair in the design and creation of their logo.
Oakland raiders
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The Dolphins began as an AFL team in 1966 and entered the NFL in the 1970 merger of the two leagues.
A debatable question. Arguably in the most recent period the Oakland Raiders have qualified, most famously when coach Bill Callahan called out his team as "the dumbest" in a postgame press conference, and with the team's run of seven straight years without a winning record.