The Miami Dolphins.
ANSWER:
The Cleveland Browns went 14-0 in 1948 and won the All-America Football Conference championship. They would go on to join the NFL two years later.
The Dolphins were the first NFL team to go undefeated in 1972.
There are college teams, of course, that go undefeated almost every season.
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The Dolphins
Yes. This year the Colts are undefeated in NFL and Sunday night football.1-0. Colts 35 Patriots 31
Chicago bulls
Only the 1972 Miami Dolphins have won a Super Bowl with an undefeated record.
the MIAMI DOLPHINS went undefeated in the year 1972