The term "America's Team" is a nickname of the National Football League (NFL)'s Dallas Cowboys. Coined in 1978, the nickname is used by team marketers, the NFL, and media outlets such as ESPN, Yahoo!, HBO, and Sports Illustrated. . History. The nickname first appeared in the team's 1978 highlight film, whose narration opens with: "They appear on television so often that their faces are as familiar to the public as presidents and movie stars. They are the Dallas Cowboys: 'America's Team'".
https://en.wikipedia.org/wiki/America%27s_Team