You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who gave the cowboys the nickname america's team?" whose answer is Bob Ryan.
Each document should contain about 30 words, and these documents should contain useful information.

Query: origin of "America's Team" nickname for the Dallas Cowboys
Useful Output:

Doc 1: The term America's Team originally came from NFL Films in the 1970s. The crews that were filming games across the league noticed that wherever the Cowboys
Doc 2: The following season, during a Cowboys game against the St. Louis Cardinals, the announcer for CBS Sports introduced them as "America's Team"
Doc 3: Without fanfare, like a contest, the name was changed to Cowboys. According to the book, "America's Team: The Official History of the Dallas
Doc 4: The Cowboys were and are "America's Team,'' no matter how many times other franchises want to claim the nickname.
Doc 5: The Story Behind the Dallas Cowboy's Nickname Para más  America's Team: A Nickname That Goes Way Beyond a Nickname | The Timeline.