The modern history of American football can be considered to have begun after the 1932 NFL Playoff Game, which was the first American football game to feature hash marks, the legalization of the forward pass anywhere behind the line of scrimmage, and the movement of the goal posts back to the goal line; it was also the first indoor game since 1902. Other innovations to occur in the years after 1932 were the introduction of the AP Poll in 1934, the tapering of the ends of the football in 1934, the awarding of the first Heisman Trophy in 1935, the first NFL draft in 1936, and the first televised game in 1939.

Another important event was the American football game at the 1932 Summer Olympics, which combined with a similar demonstration game at the 1933 World's Fair, led to the first College All-Star Game in 1934, which in turn was an important factor in the growth of professional football in the United States. American football's explosion in popularity during the second half of the 20th century can be traced to the 1958 NFL Championship Game, a contest that has been dubbed the "Greatest Game Ever Played". A rival league to the NFL, the American Football League (AFL), began play in 1960. In 1966, the NFL initiated the AFL–NFL merger between the two leagues. The merger lead to the creation of the Super Bowl, which has become the most watched television event in the United States on an annual basis.

Modern history of intercollegiate football (1933–present) Modernization of intercollegiate American football (1933–1969)

In the early 1930s, the college game continued to grow, particularly in the South, bolstered by fierce rivalries such as the "South's Oldest Rivalry", between Virginia and North Carolina and the "Deep South's Oldest Rivalry", between Georgia and Auburn. Although before the mid-1920s most national powers came from the Northeast or the Midwest, the trend changed when several teams from the South and the West Coast achieved national success. Wallace William Wade's 1925 Alabama team won the 1926 Rose Bowl after receiving its first national title and William Alexander's 1928 Georgia Tech team defeated California in the 1929 Rose Bowl. College football quickly became the most popular spectator sport in the South.Vancil (2000), pp 24–29

Several major modern college football conferences rose to prominence during this time period. The Southwest Athletic Conference had been founded in 1915. Consisting mostly of schools from Texas, the conference saw back-to-back national champions with Texas Christian University (TCU) in 1938 and Texas A&M in 1939.MacCambridge (1999), pp 124 The Pacific Coast Conference (PCC), a precursor to the contemporary Pac-12 Conference, had its own back-to-back champion in the University of Southern California which was awarded the title in 1931 and 1932. The Southeastern Conference (SEC) formed in 1932 and consisted mostly of schools in the Deep South. As in previous decades, the Big Ten continued to dominate in the 1930s and 1940s, with Minnesota winning 5 titles between 1934 and 1941, and Michigan (1933, 1947, and 1948) and Ohio State (1942) also winning titles.MacCambridge (1999), pp 148

As it grew beyond its regional affiliations in the 1930s, college football garnered increased national attention. Four new bowl games were created: the Orange Bowl, Sugar Bowl, the Sun Bowl in 1935, and the Cotton Bowl in 1937. In lieu of an actual national championship, these bowl games, along with the earlier Rose Bowl, provided a way to match up teams from distant regions of the country that did not otherwise play. In 1936, the Associated Press began its weekly poll of prominent sports writers, ranking all of the nation's college football teams. Since there was no national championship game, the final version of the AP poll was used to determine who was crowned the National Champion of college football.Vancil (2000), pp 30

The 1930s saw growth in the passing game. Though some coaches, such as General Robert Neyland at Tennessee, continued to eschew its use, several rules changes to the game had a profound effect on teams' ability to throw the ball. In 1934, the rules committee removed two major penalties—a loss of five yards for a second incomplete pass in any series of downs and a loss of possession for an incomplete pass in the end zone—and shrunk the circumference of the ball, making it easier to grip and throw. Players who became famous for taking advantage of the easier passing game included Alabama end Don Hutson and TCU passer "Slingin" Sammy Baugh.Vancil (2000), pp 28–30

In 1935, New York City's Downtown Athletic Club awarded the first Heisman Trophy to University of Chicago halfback Jay Berwanger, who was also the first ever NFL draft pick in 1936. The trophy was designed by sculptor Frank Eliscu and modeled after New York University player Ed Smith. The trophy recognizes the nation's "most outstanding" college football player and has become one of the most coveted awards in all of American sports.

NBC broadcast the first televised college football game ever, which was between Waynesburg and Fordham on September 30, 1939, on station W2XBS with one camera and Bill Stern was the sole announcer. Estimates are that the broadcast reached approximately 1,000 television sets.

College football on television continued with the second televised college game just one month later, on October 28, when the Kansas State Wildcats hosted the Nebraska Cornhuskers for their homecoming contest.

Prior to 1941, virtually all football players saw action on "both sides of the ball", playing in both offensive and defensive roles. From 1941 to 1952, the National Collegiate Athletic Association (NCAA) allowed unlimited substitution. This change was originally made because of the difficulty in fielding highly skilled players during the years of the Second World War, in which many able-bodied college-age men volunteered for or were drafted into military service.Douglas S. Looney, , Sports Illustrated, 3 September 1990, retrieved 20 January 2009. During World War II, college football players enlisted in the armed forces, some playing in Europe during the war. As most of these players had eligibility left on their college careers, some of them returned to college at West Point, bringing Army back-to-back national titles in 1944 and 1945 under coach Red Blaik. Doc Blanchard (known as "Mr. Inside") and Glenn Davis (known as "Mr. Outside") both won the Heisman Trophy, in 1945 and 1946 respectively. On the coaching staff of those 1944–1946 Army teams was future Pro Football Hall of Fame coach Vince Lombardi.Vancil (2000), pp 39

The 1950s saw the rise of yet more dynasties and power programs. Oklahoma, under coach Bud Wilkinson, won three national titles (1950, 1955, 1956) and all ten Big Eight Conference championships in the decade while building a record 47-game winning streak. Woody Hayes led Ohio State to two national titles, in 1954 and 1957, and dominated the Big Ten conference, winning three Big Ten titles—more than any other school. Wilkinson and Hayes, along with Robert Neyland of Tennessee, oversaw a revival of the running game in the 1950s. Passing numbers dropped from an average of 18.9 attempts in 1951 to 13.6 attempts in 1955, while teams averaged just shy of 50 running plays per game. Nine out of ten Heisman trophy winners in the 1950s were runners. Notre Dame, one of the biggest passing teams of the decade, saw a substantial decline in success; the 1950s were the only decade between 1920 and 1990 when the team did not win at least a share of the national title. Paul Hornung, Notre Dame quarterback, did, however, win the Heisman in 1956, becoming the only player from a losing team ever to do so.Vancil (2000), pp 41–45MacCambridge (1999) pp 172

In 1954, the NCAA emplaced a set of new rules ending free substitution, and thus requiring the use of the one-platoon system, primarily due to financial reasons.Clarence Munn, , Sports Illustrated, 29 November 1954, retrieved 20 January 2009. The system allowed only one player to be substituted between plays, which effectively put an end to the use of separate specialized units. Tennessee head coach "General" Robert Neyland praised the change as the end of "chickenshit football".

Following the enormous success of the National Football League's 1958 championship game, college football no longer enjoyed the same popularity as the NFL, at least on a national level. While both games benefited from the advent of television, since the late 1950s, the NFL has become a nationally popular sport while college football has maintained strong regional ties.MacCambridge (1999), pp 171Bennett (1976) pp 56 reprinted from Official Super Bowl XXXIII Game Program.

As professional football became a national television phenomenon, college football did as well. In the 1950s, Notre Dame, which had a large national following, formed its own network to broadcast its games, but by and large the sport still retained a mostly regional following. In 1952, the NCAA claimed all television broadcasting rights for the games of its member institutions, and it alone negotiated television rights. This situation continued until 1984, when several schools brought a suit under the Sherman Antitrust Act; the Supreme Court ruled against the NCAA and schools are now free to negotiate their own television deals. ABC Sports began broadcasting a national Game of the Week in 1966, bringing key matchups and rivalries to a national audience for the first time.Vancil (2000) pp 46–48

New formations and play sets continued to be developed. Emory Bellard, an assistant coach under Darrell Royal at the University of Texas, developed a three-back option style offense known as the wishbone. The wishbone is a run-heavy offense that depends on the quarterback making last second decisions on when and to whom to hand or pitch the ball to. Royal went on to teach the offense to other coaches, including Bear Bryant at Alabama, Chuck Fairbanks at Oklahoma and Pepper Rodgers at UCLA; who all adapted and developed it to their own tastes.Vancil (2000), pp 56 The strategic opposite of the wishbone is the spread offense, developed by professional and college coaches throughout the 1960s and 1970s. Though some schools play a run-based version of the spread, its most common use is as a passing offense designed to "spread" the field both horizontally and vertically.Bennett (1976), Appendix pp 209–217 Some teams have managed to adapt with the times to keep winning consistently. In the rankings of the most victorious programs, Michigan, Texas, and Notre Dame are ranked first, second, and third in total wins.

After the 1964 season, twelve years since the mandate requiring one-platoon, the NCAA repealed the rules enforcing its use and allowed an unlimited amount of player substitutions.17 Reasons Why Knute Rockne Wouldn't Recognize This Game, Athlon Sports, retrieved 20 January 2009. This allowed, starting with the 1965 season,Robert C. Gallagher, The Express: The Ernie Davis Story, p. 63, Random House, 2008, . teams to form separate offensive and defensive units as well as "special teams" which would be employed in kicking situations. The reinstatement of the two-platoon system allowed players to become more specialized by focusing on a limited number of plays and skills related to their specific position.K. Adam Powell, Woody Durham, "An Era of Change (1963–1968) (Google Books cache), Border Wars: The First Fifty Years of Atlantic Coast Conference Football, Scarecrow Press, 2004, , . By the early 1970s, however, some university administrators, coaches and others were calling for a return to the days of one-platoon football.One-platoon football seen as a money saver, The Free-Lance Star, November 22, 1974.