MIA Dolphins

The Miami Dolphins joined the American Football League (AFL) when an expansion franchise was awarded to lawyer Joseph Robbie and actor Danny Thomas in 1965 for $7.5 million, although Thomas would eventually sell his stake in the team to Robbie. During the summer of 1966, the Dolphins' training camp was in St. Pete Beach with practices in August at Boca Ciega High School in Gulfport.

The Dolphins were the worst team with a 15–39–2 record in their first four seasons under head coach George Wilson, before Don Shula was hired as head coach. Shula was a Paul Brown disciple who had been lured from the Baltimore Colts, after losing Super Bowl III two seasons earlier to the AFL's New York Jets, and finishing 8–5–1 the following season. Shula got his first NFL coaching job from then-Detroit head coach George Wilson, who hired him as the defensive coordinator. The AFL merged with the NFL in 1970, and the Dolphins were assigned to the AFC East division in the NFL's new American Football Conference.

For the rest of the 20th century, the Shula-led Dolphins emerged as one of the most dominant teams in the NFL, with only two losing seasons between 1970 and 1999. They were extremely successful in the 1970s, completing the first complete perfect season in NFL history by finishing with a 14–0 regular-season record in 1972 and winning the Super Bowl that year. It was the first of two consecutive Super Bowl wins and one of three appearances in a row. The 1980s and 1990s were also moderately successful. The early 80s teams made two Super Bowls despite losing both times and saw the emergence of future Hall of Fame quarterback Dan Marino, who went on to break numerous NFL passing records, holding many of them until the late 2000s. After winning every game against the division rival Buffalo Bills in the 1970s, the two teams gradually developed a competitive rivalry in the 80s and 90s, often competing for AFC supremacy when Jim Kelly emerged as the quarterback for the Bills. The Dolphins have also maintained a strong rivalry with the New York Jets throughout much of their history.

Following the retirements of Marino and Shula and the rise of Tom Brady and the New England Patriots, the Dolphins suffered a decline in the 2000s and 2010s. During this period, the team's level of play was largely described as mediocre. They have only made the playoffs four times since Marino's retirement and have largely been unable to find a consistent quarterback to replace him. The team suffered a franchise-worst 1–15 season in 2007. They rebounded the following season, becoming the first team in NFL history to win their division and make a playoff appearance following a league-worst season.^[] That same season, the Dolphins upset the New England Patriots on the road during Week 3 thanks to the use of the gimmick Wildcat offense, which handed the Patriots their first regular-season loss since December 10, 2006, in which coincidentally, they were also beaten by the Dolphins. However, this success in 2008 proved to be an outlier during this period in the franchise's history; to date, it is the last season the Dolphins won the AFC East. However, the Dolphins have been competitive against the Patriots despite their decline, with notable wins coming in 2004, 2008, 2014, 2018, and 2019. Until 2020, they were also the last team in the AFC East to win the division championship aside from the Patriots, doing so in 2008.