Chacon narrowly won again in 1982 after a knockdown of Limón with ten seconds left in the last of fifteen rounds.
Racism was considerable in the United States at that time; not only were Blacks relegated in the South, but many western area stores, restaurants and services segregated the Hispanic community as well.
This may have led to many immigrants, who were already facing trouble with their migratory status in the first place, to not encourage their children to learn proper Spanish.
Art Aragon was a very famous Chicano boxer, from whom Oscar De La Hoya would later inherit the nickname "The Golden Boy".
The Olympic Auditorium in Los Angeles, under the auspices of Aileen Eaton, became a mecca of sorts for Mexican-American and Mexican fighters alike.
Bobby Chacon claimed the WBC world Featherweight title on September 7, 1974, in Los Angeles by knocking out Alfredo Marcano in ten rounds.
On December 7, 1975, the first Chacon–Limón encounter took place, at the Plaza de Toros Calafia in Mexicali, Baja California, Mexico.
Both Chacon and Limón had heavy chances at stake: both were searching for a title try at the Jr. Lightweight division at the time.
At stake were the NABF Super Featherweight (Jr. Lightweight) title, and, perhaps more importantly, an opportunity to fight Alexis Argüello for the WBC's world Jr. Lightweight championship (both fighters would challenge Arguello for this title, Chacon was defeated by the Nicaraguan with a seventh-round technical knockout, and Limón by an eleventh-round technical knockout).
Because the fight was stopped as a consequence of a headbutt and not an actual punch, the three judges' scorecards were brought to declare a winner.
Chacon was leading on cards, however, California rules at the time stated that if one fighter leads on card at the time of the stoppage but he or she commits an unintentional head butt, the contest's result was a draw, thus the fight was declared a seven-round technical draw.
Having lost to Arguello recently, he thought he needed to beat Chacon again in order to stay as a ranked challenger.
The two rivals once again fought at a brisk pace, connecting with hard punches and refusing to change the fighting styles both displayed through their careers.
Chacon won the fight by a ten-round split decision, avenging his earlier loss to Limón.
He defeated Idelfonso Bethelmy of Venezuela by knockout in fifteen on December 11, 1980, to claim the title vacated by Arguello.
His decision to go on with boxing had reportedly caused his first wife, Valorie Chacon, to commit suicide months before Chacon–Limón IV.
Keith Jackson was commentating at ringside and the fight was televised live on ABC's Wide World of Sports.
Limón began the fight quick, combining bolo punches and uppercuts to the body to dominate the first few rounds.
With 20 seconds remaining in the third round Limón scored a knockdown via a stiff straight left counter which caught Chacon, who was knocked off balance and touched both gloves to the canvas.
Limón, however, kept fighting at a furious pace, and, in round ten, he sent Chacon to the floor for a second time.
While Limón got up, a mandatory standing count was carried by the referee, and by the time the fight was allowed to go on, there was only two seconds left in the bout.