Instruct: Given a question, retrieve documents that answer the question.
Query: When did the American Football League end?
The rival American Football League arose in 1960 and challenged the NFL's dominance. The AFL began in relative obscurity but eventually thrived, with an initial television contract with the ABC network. The AFL's existence forced the conservative NFL to expand to Dallas and Minnesota in an attempt to destroy the new league. Meanwhile, the AFL introduced many new features to Professional Football in the United States: official time on the scoreboard clock, rather than on a watch in the referee's pocket, as the NFL did; optional two-point conversions by pass or run after touchdowns; names on the jerseys of players; and several others, including expansion of the role of minority players, actively recruited by the league in contrast to the NFL. The AFL also signed several star college players that had also been drafted by NFL teams. Competition for players heated up in 1965, when the AFL New York Jets signed rookie Joe Namath to a then-record US$437,000 contract. A five-year, $40 million NBC television contract followed, which helped to sustain the young league. The bidding war for players ended in 1966, when NFL owners approached the AFL regarding a merger, and the two leagues agreed on one that would take full effect in 1970. This agreement provided for a common draft that would take place each year, and it instituted an annual World Championship game to be played between the champions of each league. That game began play at the end of the 1966 season. Once the merger was completed, it was no longer a championship game between two leagues, and reverted to the NFL championship game, which came to be known as the Super Bowl.
When the AFL and the NFL officially merged in 1970, the combined league divided its teams into the American Football Conference (AFC) and the National Football Conference (NFC). It was then decided (officially announced on January 26, 1970) that CBS would televise all NFC teams (including playoff games) while NBC would carry games from all AFC teams. For interconference games, CBS would broadcast them if the visiting team was from the NFC and NBC would carry them when the visitors were from the AFC. This was in line with the NFL television blackout rules of the time, meaning that every televised game of a local NFL team would be on the same channel (at the time, home games were banned from local television regardless of sell-out status, while road games are required to be aired in the teams' primary media markets, and select neighboring markets as well, even if it is not the most popular team in the market). The two networks also divided up broadcast rights to the Super Bowl on a yearly rotation.
At the end of the 1966 season, the Super Bowl began to be played between the AFL champion and the NFL champion. After the AFL/NFL merger in 1970, the Super Bowl continued to be played between the AFC champion and the NFC champion. The AFL champion lost the first two Super Bowls. The 1968 AFL champion New York Jets with Joe Namath at quarterback became the first AFL team to win the Super Bowl. Starting with that Super Bowl, the AFL or AFC champion won 11 out of 13 Super Bowls. However, the AFC champion lost 13 consecutive Super Bowls, from the 1984 AFC champion Miami Dolphins through the 1996 AFC champion New England Patriots. Overall, the AFL or AFC champion has won 25 of the 52 Super Bowls played through the end of the 2017 season.
The season is recognized as perfect by the Pro Football Hall of Fame, although the National Football League (NFL), which absorbed the Browns when the AAFC dissolved in 1949, does not recognize it. Ohio senator Sherrod Brown wrote a letter to NFL commissioner Roger Goodell in 2008 asking the league to officially recognize AAFC team statistics, including the perfect season. The 2007 New England Patriots were vying to complete a 19–0 season at the time and join the 1972 Miami Dolphins as the only teams to register a perfect record.
The season ended when the Kansas City Chiefs defeated the Buffalo Bills in the AFL Championship game, and was defeated by the National Football League's Green Bay Packers in the first ever AFL-NFL World Championship Game which is now known as the Super Bowl.
NBC broadcast the first televised National Football League (NFL) game when they carried the 22 October 1939 game between the Philadelphia Eagles and the Brooklyn Dodgers. The same year, the first nationwide radio broadcast of an NFL championship game was carried on the Mutual Broadcasting System. While the NFL had weak television deals that ranked behind college football and even the Canadian Football League in the 1950s, the broadcast rights of the NFL would go on to become an important property following the 1958 NFL Championship and the later establishment of the American Football League in 1960. "Monday Night Football", "NFL on Fox", and "NBC Sunday Night Football" have changed the landscape of American football broadcasts, including the scheduling of the Super Bowl, transforming it from an afternoon broadcast into a primetime spectacle. The price for the NFL's broadcast rights has increased steadily over the past several decades, in part because of bidding wars between the numerous networks and the fear of losing stature due to the loss of NFL programming; as of the most recent contract the league nets annual fees of over $6 billion, or half of the league's overall revenue, from television rights alone. Four of the five major sports television units in the United States, and the four companies that control all of the major broadcast networks, currently own some NFL rights.
The following charts list movements of franchises in the modern eras of the major North American sports leagues. It does not include:The history of the NFL fully incorporates that of the fourth American Football League, which began operation in 1960 with eight teams and became by far the most successful rival to the NFL. In 1966, the two leagues agreed to a merger that took full effect in 1970. All teams from the 1960–1969 AFL were brought intact to the NFL, and the current NFL recognizes all AFL records and statistics as its own.Relocations in the NHL have been unique in that most of the teams have changed their names after relocating, as opposed to keeping their identity with the old market. Only one NHL team that relocated—both in the pre-Original Six era and in the modern era—kept its name: the Calgary Flames.
In 1928, a dispute broke out between the American Soccer League and the United States Football Association regarding participation in the National Challenge Cup. The League decided to boycott the cup, but three teams, Bethlehem Steel, the Newark Skeeters and the New York Giants all entered the competition. When the league suspended the three teams, the USFA offered to bankroll the creation of a new league, the Eastern Professional Soccer League. This new league included the three ex-American Soccer League teams, four teams from the Southern New York Football Association and one newly created team, New York Hakoah. By the fall of 1929, the onset of the Great Depression and the competition between the ASL and EPSL had created significant financial problems for both leagues and the USFA. Consequently, the USFA and the two leagued came to an agreement to end the dispute on October 9, 1929. The two leagues entered into discussions to merge. By the first week of November 1929, the merger was complete with the new league taking the name of the Atlantic Coast Soccer League. The new league decided to run a two-part 1930 season. Oddly enough, they decided to play the first games of the 1930 season during the weekend of November 6, 1929. The first half of the season ended the last weekend of April 1930. During the summer of 1930, the league resumed the name American Soccer League, beginning the second half of the season in September and ending the first weekend of January 1931. Although the league attempted to continue operations as it had before the dispute with the USFA, it began to fail during the 1930 season. The dispute between the ASL and USFA financially weakened the league and its teams. The onset of the Great Depression in 1929 further exacerbated these problems. This resulted in significant changes in the lineup of teams in the league.
The New England Patriots are an American football team based in Foxborough, Massachusetts. They compete in the National Football League (NFL) as a member club of the league's American Football Conference (AFC) East division. Originally called the Boston Patriots, the team was founded as one of eight charter members of the American Football League (AFL) in 1960 under the ownership of Billy Sullivan. The team became part of the NFL when the two leagues merged in 1970. The following year, they moved from Boston to nearby Foxborough, and changed their name to the New England Patriots.
The Buffalo sports curse is an explanation for Buffalo's inability to win a Super Bowl, Stanley Cup, or an NBA championship. Those who believe in the Buffalo curse cite as examples the four consecutive Super Bowl losses by the Buffalo Bills for the 1990–1993 seasons (and the team's failure to qualify for the NFL playoffs from 2000 to 2017), as well as the failure of the Buffalo Sabres ever to win the Stanley Cup (despite winning the Presidents' Trophy for most regular-season points in 2006–07). The Bills, however, won two American Football League (AFL) titles (1964 and 1965), the latter occurring just months before an agreement was reached to merge the AFL and the National Football League (NFL) (Bills owner Ralph Wilson initiated the talks to merge the two leagues, according to the Pro Football Hall of Fame). In spite of that, it has been argued that this was achieved when the AFL was in its infancy as an upstart league, garnering little, if any, national attention before merging with the established NFL, and that even if they are considered to be at par, since there would be no Super Bowl until after the 1966 season, the Bills could be no greater than co-champions. There have been conflicting suggestions on how the Bills would have fared against the Green Bay Packers or Cleveland Browns, much as there have been disputes over how well the San Diego Chargers would have played against the Bears in 1963, had the Super Bowl existed at that time.
The history of the Cleveland Browns American football team began in 1944 when taxi-cab magnate Arthur B. "Mickey" McBride secured a Cleveland franchise in the newly formed All-America Football Conference (AAFC). Paul Brown was the team's namesake and first coach. The Browns began play in 1946 in the AAFC. The Browns won each of the league's four championship games before the league dissolved in 1949. The team then moved to the more established National Football League (NFL), where it continued to dominate. Between 1950 and 1955, Cleveland reached the NFL championship game every year, winning three times.
Further playoff defeats followed. In 1968, as a 32-year-old Ryan was benched in favor of Bill Nelsen, the Browns finished with a 10–4 record but lost to the Colts in the playoffs. Another playoff loss ended the Browns' season in 1969, this time to the Minnesota Vikings. After the American Football League's merger with the NFL was finalized in early 1970, the Browns, Pittsburgh Steelers and Baltimore Colts moved to the new American Football Conference along with the 10 teams of the former AFL. The Browns were slotted in the AFC Central in the 26-team league, alongside the Steelers, the Houston Oilers and the Cincinnati Bengals, a team Paul Brown founded in 1968 in the AFL. Cleveland's first big move under the new league structure was to trade star receiver Paul Warfield in January 1970 to the Miami Dolphins for the rights to draft Purdue University quarterback Mike Phipps as a replacement for Bill Nelsen, who had a pair of bad knees.
The Browns opened the 1970 season by beating Joe Namath and the New York Jets in the first-ever broadcast of Monday Night Football on September 21. The following month, Cleveland faced Paul Brown's Bengals for the first time in a regular-season game, winning 30–27. That game was a highlight in an otherwise unsuccessful season. The Browns lost their second match against the Bengals 14–10 in November, when Phipps made his first start — Brown called it "my greatest victory" — and finished 7–7.
The Sports Broadcasting Act of 1961 and Public Law 89-800, which govern the antitrust exemptions given to the National Football League, prohibit the broadcasting of NFL games within 75 miles of any high school football game on Friday nights between September and early December. Because most populated areas of the United States have at least one high school football game within a 75-mile radius, and because broadcasting is an integral part of the NFL's business model (roughly half of the league's revenue comes from television contracts), this effectively prohibits the playing of NFL games in competition with high school football. (These rules do not apply during preseason, when Friday night games are common, nor does it apply at the end of the season, though the only time regular season games are played on Friday in the NFL is on Christmas.) Only recently have national sports television channels fully capitalized on this rule; since 2005, the ESPN family of networks (usually the sub-networks ESPN2, ESPNU and online broadcaster ESPN3, although the main channel also shows occasional games) has aired regular season matchups between nationally ranked teams under the "High School Showcase" banner. Fox Sports 1 also included high school football in its lineup when it launched in 2013.
After winning the 1945 NFL Championship Game, the franchise moved to Los Angeles in 1946, making way for Paul Brown's Cleveland Browns of the All-America Football Conference and becoming the only NFL championship team to play the following season in another city. The club played their home games at the Los Angeles Memorial Coliseum before moving into a reconstructed Anaheim Stadium in Orange County, California in 1980.
National Football League, established in 1996 by governing body All India Football Federation (AIFF) was the first "semi-professional" football league in India. 
The League was renamed and restructured and the I-League was founded in 2006 after India's former top league the National Football League disbanded in a successful effort aimed at increasing the game in India. Links with clubs that were not in the I-League were maintained, and each season the bottom two clubs are relegated from the I-League and replaced by two from the I-League 2nd Division. The I-League is currently contested between 11 clubs. The Kolkata Derby in the I League (and other tournaments) played between Mohun Bagan and East Bengal is one of the most fierce rivalries in the world (featured in FIFA website) and one of the oldest derbies in the world (90 years). An average 80, 000 to 100, 000 supporters throng the stadium in this special fixture.
Only one professional football league has a permanent presence in Canada: the Canadian Football League (CFL), an organization founded in 1958 to accommodate the ongoing trend of professionalism in the Canadian football ranks since the 1940s. The CFL, like most amateur Canadian football leagues, plays on a larger field using a rulebook with several significant rule differences compared to the game as it is played in the United States. The league is composed of two divisions and nine teams in most of the largest Canadian markets, with at least one team in each province between British Columbia (BC Lions) and Quebec (Montreal Alouettes) inclusive. The only presence in Atlantic Canada is a semi-regular series of games in Moncton (Touchdown Atlantic) and a smattering of earlier preseason contests. The CFL operates a two-week preseason beginning in June, an 18-game season from July to October, and a six-team playoff tournament, culminating in the Grey Cup on the fourth weekend of November.
While there are various semi-professional football leagues, none have any affiliation with the National Football League (NFL). The NFL and its teams have had working relationships with several independent leagues in the past, including the Association of Professional Football Leagues, the Atlantic Coast Football League, and most recently, the league owned-and-operated NFL Europe. In modern times, the NFL has developed players not ready for the active roster through each team's practice squad.
The National Football League is the only one of the four major sports leagues that does not have a formalized farm system. The source for almost all NFL players is college football. Drafted players from college immediately join the main team; if they fail to make the regular season roster, a limited number of players may be assigned to the practice squad. NFL teams rarely recruit players from other gridiron football leagues. American football also has the least global reach for prospects, with one exception being several players from other codes of football primarily as kickers and punters. The league's teams backed the World League (later known as NFL Europe) in the 1990s and 2000s, and purchased teams in the Arena Football League for a period in the 2000s.
The Canadian Football League is the highest level of play in Canadian football. The league was organized in 1956 as a cooperative agreement between two regional leagues, the Big Four (which dated to 1907) and the WIFU (which was founded in 1936), and became independent from Football Canada in 1958. The league now consists of nine teams, all based in Canada. The Grey Cup is awarded annually to the champion every November and is the highest attended sporting event in the nation. The oldest extant teams, the Hamilton Tiger-Cats and the Toronto Argonauts, trace their origins to the late 1860s and early 1870s, which ranks them amongst the oldest professional sports teams of any kind still in existence on the continent. The CFL attempted an expansion into the United States in cities that had no NFL team between 1993 and 1995, though the expansion teams all either folded or relocated to Canadian cities.
The National Football League (NFL) regular season begins on the weekend following the first Monday of September (i.e, the weekend following the Labor Day holiday) and ends in December or early January. It consists of 256 games, where each team (32 total) plays 16 games during a 17-week period. Since 2012, the NFL schedule generally has games in one of five time slots during the week. The first game of the week is played on Thursday night, kicking off at 8:20 PM (ET). The majority of games are played on Sunday, most kicking off at 1:00 PM (ET), some late afternoon games starting at 4:05 or 4:25 PM (ET). Additionally, one Sunday night game is played every week at 8:20 PM (ET). One Monday night game then starts at 8:15 PM (ET) every week with the exception of the first week of the regular season, in which two Monday night games are played back-to-back (the second game always occurring on the West coast), as well as the last week of the season, in which no Monday night game is held. In addition to these regularly scheduled games, there are occasionally games at other times, such as a Saturday afternoon or evening, or the annual Thanksgiving Day games in which three games are played. During the final week of the regular season, all games are held on Sunday.
Gridiron football does not operate on a league system. Different professional leagues play by very different sets of rules in different seasons (the NFL plays 11-a-side on a 100-yard field in autumn and early winter, the CFL uses 12-a-side on a 110-yard field in summer and early fall, while arena football and the minor indoor leagues each play 8-a-side on a 50-yard field in the spring and early summer). There have been attempts at forming true minor leagues for the professional game (most recently with 2017's The Spring League); none so far have been able to balance the major leagues' requests with the ability to maintain financial solvency.
The season ended when the New York Jets (11–3) defeated the Oakland Raiders (12–2) in the AFL championship game on December 29 at Shea Stadium in New York City. Two weeks later, the Jets defeated the National Football League's Baltimore Colts in Super Bowl III in one of the biggest sports upsets in history. Because the AFL lost the first two Super Bowl games, the planned merger between the NFL and the AFL was in jeopardy. The Jets win helped keep the merger alive.
November 1926 wasn't much brighter for the house of cards that was the American Football League. The Brooklyn Horsemen left the league when it merged with its NFL cousins, the Lions, and played the last three games of its existence (three shutout losses) as the Horsemen. By the middle of the month, the Boston Bulldogs called it quits, as did Rock Island a week later. By Thanksgiving of 1926, there were only four teams operating in the AFL (New York, Chicago, the Wildcats, and Philadelphia), with only the Quakers making a profit for the year (boosted in part by huge attendances stemming from the United States Sesquicentennial celebration and the very large stadium capable of hosting them) and Pyle was spending money to keep the other three teams afloat.
Like the competitor 'AA' and the third "American Football League", the "Dixie League" suspended operations after the Pearl Harbor attack by Japan, on the "Day of Infamy" - Sunday, December 7, 1941; unlike the AFL, the football minor league reorganized after the end of the War and resumed competition in the first post-war season year of 1946. The following year, the 'D.L.' collapsed when one of its member teams purchased the assets of a defunct team in the other pro football minor loop, the "American Association" (which then changed its name to the "American Football League" in 1946)... and opted to jump leagues.
The season ended when the San Diego Chargers defeated the Boston Patriots in the AFL championship game – to this date the only major league championship won by the Chargers and the city of San Diego.