In 1958, the National Football League championship game between the Baltimore Colts and New York Giants drew millions of viewers on NBC and established pro football as an entertainment commodity to rival baseball as the most popular sport in the United States. The NFL suddenly had a line of businessmen waiting to purchase new franchises in new markets, but most were arrogantly turned away. This prompted Lamar Hunt, the wealthy son of an oil tycoon, to recruit seven businessmen from cities hungry for pro football to form a rival league. The resulting American Football League was publicly welcomed by NFL Commissioner Bert Bell, who said that competition would stimulate both leagues. However, the NFL did not sit idly by and wait for the AFL to gain market share. Instead, it quickly expanded into Hunt’s hometown of Dallas and into Minneapolis, another of the cities the AFL had designated for a franchise.
The American Football League chose Oakland as a replacement for Minneapolis, as well as Los Angeles, Dallas (for Hunt’s franchise, the Dallas Texans that moved to Kansas City in 1962), New York, Buffalo, Boston, Denver and Houston as the original eight AFL cities. The league piqued fan interest with an entertaining product on the field, a high-flying aerial brand of football that contrasted with the stingy defenses and running attacks of the older NFL. By 1962, the AFL had drawn 1 million fans to its games.
In 1965, the AFL scored a television contract with NBC. That same year, New York Jets owner Sonny Werblin lured quarterback Joe Namath out of the University of Alabama to the AFL with the biggest contract in pro football history. Even though Namath was also signed by the St.Louis Cardinals, Joe went with the New York Jets. The NFL’s prediction and hope that the AFL would field only second-rate players and washed-up former NFL players was not to be: Instead, the two leagues began to compete over fans, players and coaches. An unspoken agreement that one league would not sign the other league’s players was broken in 1966 when the NFL’s New York Giants signed place-kicker Pete Gogolak away from the AFL’s Buffalo Bills. Another example was Mike Ditka signing with the Oilers (He never did play for the Houston Oilers). As neither league could afford a bidding war, owners soon began to talk of a merger.
Under the merger agreement announced on June 8, 1966, the new league would be called the NFL, and split into the American Football Conference (AFC) and the National Football Conference (NFC) which is still used today. All eight of the original AFL teams would all be absorbed by the NFL, unlike in 1946 when the NFL merged with the rival All-America Football Conference but only took in its Baltimore, Cleveland and San Francisco franchises and dissolved four other teams.
While many AFL players and observers believed their league was the equal of the NFL, their first two Super Bowl performances did nothing to prove it. However, on November 17, 1968, when NBC cut away from a game between the Jets and Raiders to air the children's movie Heidi, the ensuing uproar helped disprove the notion that fans still considered the AFL an inferior product. The perception of AFL inferiority forever changed on January 12, 1969, when the AFL Champion New York Jets shocked the heavily favored NFL Champion Baltimore Colts in Super Bowl III. The Colts, who entered the contest favored by as many as 18 points, had completed the 1968 NFL season with a 13–1 record, and won the NFL title with a convincing 34–0 win over the Cleveland Browns. Led by their stalwart defense—which allowed a record-low 144 points—the 1968 Colts were considered one of the best-ever NFL teams.
By contrast, the Jets had allowed 280 points, the highest total for any division winner in the two leagues. They had also only narrowly beaten the favored Oakland Raiders 27–23 in the AFL championship game. Jets quarterback Joe Namath recalled that in the days leading up to the game, he grew increasingly angry when told New York had no chance to beat Baltimore. Three days before the game, a frustrated Namath responded to a heckler at the Touchdown Club in Miami by declaring, "We're going to win Sunday, I'll guarantee you." Namath and the Jets made good on his guarantee as they held the Colts scoreless until late in the fourth quarter. The Jets won, 16–7, in what is considered one of the greatest upsets in American sports history. With the win, the AFL finally achieved parity with the NFL and legitimized the merger of the two leagues.That notion was reinforced one year later in Super Bowl IV, when the AFL champion Kansas City Chiefs upset the NFL champion Minnesota Vikings, 23–7, in the last championship game to be played between the two leagues. The Vikings, favored by 12½ points, were held to just 67 rushing yards.
Prior to the start of the 1970 NFL season, the merged league was organized into two conferences of three divisions each. All ten AFL teams made up the bulk of the new American Football Conference. To avoid having an inequitable number of teams in each conference, the leagues voted to move three NFL teams to the AFC. Motivated by the prospect of an intrastate rivalry with the Bengals as well as by personal animosity toward Paul Brown, Cleveland Browns owner Art Modell quickly offered to include his team in the AFC. He helped persuade the Pittsburgh Steelers (the Browns' archrivals) and Baltimore Colts (who shared the Baltimore/Washington, D.C. market with the Washington Redskins) to follow suit, and each team received US $3 million to make the switch. All the other NFL squads became part of the National Football Conference.
The American Football League stands as the only professional football league to successfully compete against the NFL. When the two leagues merged in 1970, all ten AFL franchises and their statistics became part of the new NFL. Every other professional league that had competed against the NFL before the AFL-NFL merger had folded completely: the three previous leagues named "American Football League" and the All-America Football Conference. From an earlier AFL (1936–1937), only the Cleveland Rams (now the Los Angeles Rams) joined the NFL and are currently operating, as are the Cleveland Browns and the San Francisco 49ers from the AAFC. A third AAFC team, the Baltimore Colts (not related to the 1953–1983 Baltimore Colts or to the current Indianapolis Colts franchise), played only one year in the NFL, disbanding at the end of the 1950 season.The league resulting from the merger was a 26-team juggernaut (since expanded to 32) with television rights covering all of the Big Three television networks and teams in close proximity to almost all of the top 40 metropolitan areas, a fact that has precluded any other competing league from gaining traction since the merger; failed attempts to mimic the AFL's success included the World Football League (1974–75), United States Football League (1983–85), XFL (2001) and United Football League (2009–2012).
The NFL adopted some of the innovations introduced by the AFL immediately and a few others in the years following the merger. One was including the names on player jerseys. The older league also adopted the practice of using the stadium scoreboard clocks to keep track of the official game time, instead of just having a stopwatch used by the referee. The AFL played a 14-game schedule for its entire existence, starting in 1960. The NFL, which had played a 12-game schedule since 1947, changed to a 14-game schedule in 1961, a year after the American Football League instituted it. The AFL also introduced the two-point conversion to professional football thirty-four years before the NFL instituted it in 1994 (college football had adopted the two-point conversion in the late 1950s). All of these innovations pioneered by the AFL, including its more exciting style of play and colorful uniforms, have essentially made today's professional football more like the AFL than like the old-line NFL. The AFL's challenge to the NFL also laid the groundwork for the Super Bowl, which has become the standard for championship contests in the United States of America.
The AFL was also the most successful of numerous upstart leagues of the 1960s and 1970s that attempted to challenge a major professional league's dominance. All nine teams that were in the AFL at the time the merger was agreed upon were accepted into the league intact (as was the tenth team added between the time of the merger's agreement and finalization).
Sources
https://www.pro-football-reference.com/
https://www.profootballarchives.com/index.html
https://americanfootballdatabase.fandom.com/wiki/Football_Wiki
https://www.gridiron-uniforms.com/GUD/controller/controller.php?action=main
https://www.profootballhof.com/hall-of-famers/
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His career ended abruptly after his arrest in 2013. On April 19, 2017, Aaron Hernandez was found “hanging from a bed sheet in his prison cell, a death that was later ruled a suicide. A day later, Hernandez’s lawyer announced the former tight end’s brain would be donated to Boston University to study for the potential of chronic traumatic encephalopathy (CTE)” and it was true, he indeed did have CTE. The league had already faced public relations 
problems after other high-profile players were found to have C.T.E., including Junior Seau, Ken Stabler and Frank Gifford. Dave Duerson, Andre Waters and Ray Easterling, among others who committed suicide. This story just added to fact that CTE has caused many former players to end their life to the symptoms that effect their everyday life. For example CTE causes “Alzheimer’s-like symptoms, including memory loss, confusion, aggression, rage and, at times, suicidal behavior.” In the future, their will most likely be more players who are affected by these brain injuries and hopefully this world never has another case like the Aaron Hernandez/Odin Lyold case.
kers and regained the franchise. These backers, known as the “Hungry Five”, formed the Green Bay Football Corporation.
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The history of the Arizona Cardinals is extraordinary compared to most franchises in the NFL. The Cardinals compete in the National Football League as a member of the league’s National Football Conference West division. The Cardinals were founded as the Morgan Athletic Club in 1898, and are the oldest continuously run professional football team in the United States. The team was established in Chicago and was a charter member of the NFL (APFA which the league was called its first two years) in 1920. Along with the Chicago Bears, the club is one of two NFL charter member franchises still in operation since the league’s founding, the other being the Bears (back then known as the Staleys). The club moved to St. Louis decades later in 1960 and played in that city through 1987 then moved to Phoenix. 
