1970, but they entered the AFL in '66.
they became the superstars in my category in 1966 eddy619 who are the Miami Dolphins my hero go Miami
The Dolphins began as an AFL team in 1966 and entered the NFL in the 1970 merger of the two leagues.
1966 .............
the MIAMI DOLPHINS went undefeated in the year 1972
The Miami Dolphins play football. The Miami Dolphins are one of the older franchises in the National Football League (NFL). The Dolphins are the only franchise in NFL history to ever have a perfect season. There quarterback that year...Dan Marino.
1920
1937
1976
1961
1953
2003
1933
The Vikings joined the NFL as an expansion team in 1961.