In the merger deal, the owners of Telesistema had 75 percent of the stocks, while the owners of Televisión Independiente had the rest, which were sold to Telesistema later because of financial problems.On September 7, 1970, "24 Horas" debuted and became one of Mexico's most watched news programs.The host, journalist Jacobo Zabludovsky, anchored the program for almost 3 decades.
On January 8, 1973, both Telesistema Mexicano and Televisión Independiente de México merged, taking on the name Televisa, an acronym for Televisión Via Satélite in Spanish.
In 1975, brothers Emilio Diez Barroso and Fernando Diez Barroso began working in the presidency offices of Televisa.
Televisa started to transmit several programs produced by the Universidad Nacional Autónoma de México in 1977.
On March 3, 1983, Canal 8 was reformatted to become a cultural channel, offering informative programs, debates and cultural shows.
In 1985, a frequency swap moved the station from channel 8 to 9, and Televisa also decided to swap its callsign for that of XEQ-TV, which had been on channel 9 and broadcast from Altzomoni; the XHTM callsign was moved to that station, which was moved to channel 10.
Canal 9 eventually became Galavisión, now known as Gala TV.
On September 19, 1985, an earthquake measuring 8.1 on the Richter scale caused widespread damage in Mexico City and destroyed the south tower of Televisa's main building.
Nonetheless, Televisa's transmissions were not seriously affected. In 1991, Televisa, with help from Japanese public television network Nippon Hōsō Kyōkai, began its first broadcast in HDTV, using the Japanese MUSE system.
Grupo Televisa was founded in 1955 as Telesistema Mexicano, linking Mexico's first three television stations: XHTV-TV (founded in 1950), XEW-TV (1951) and XHGC-TV (1952).
It was (and currently still is) owned by the Azcárraga family, O'Farril family and Ernesto Barrientos Reyes, who had signed on Mexico's first radio station, XEW-AM, in 1930.
Its headquarters, known as Televicentro, were originally located on Avenida Chapultepec in downtown Mexico City. The channel was the first national network to be broadcast in color in 1963.