The whole “America’s Team” thing was a creation of Tex Schramm with the help of his good buddy NFL Commissioner Pete Rozelle. It was actively pushed by the NFL. The end result is that the Cowboys are the queens of the bandwagon and T-shirt fans.
Nope, that's the Steelers. Go to any sports bar in America where the Steelers are playing the local market team (including the DFW area), and you'll see a legion of slack jawed Steeler fans who can't even find Pennsylvania on a map wearing jerseys and swinging those stupid towels.