In 1976 the Tampa Bay Buccaneers went 0-14 in their first season in the NFL.
During the period of fourteen-game regular seasons between 1961 and 1977 no other team went 0-14, though the 1969 Pittsburgh Steelers won their opener against the Detroit Lions and then lost their remaining thirteen games.
Two other teams, the 1980 New Orleans Saints and the 2008 Detroit Lions, have began a sixteen-game season 0-14. The 1980 Saints beat the New York Jets in their second-last game to finish 1-15, but the 2008 Lions lost their remaining two games to finish with the first season consisting of only losses since 1976.
2008 Detroit went 0-16, The only team to go winless since the league went to a 16 game schedule in 1978.
The Cowboys of course.
the Dallas Cowboys
Dallas Cowboys, 8
the MIAMI DOLPHINS went undefeated in the year 1972
Tie between Dallas and Pittsburg
The Awesome New Oeleans Saints
The 1972 Miami Dolphins went 14-0 in the regular season, and then went on to win the Super Bowl The above answer is incorrect. The correct answer is the 1920 Akron Pros, who went 8-0-3 and were crowned as the NFL's first champions. The '72 Dolphins were the first team to have a *perfect* season, but not the first to go undefeated.
The Tennessee Titans went 13 & 3.
The Pittsburgh Steelers won the 2009 Superbowl.