Somewhere along the line the moniker 'America's Team' was bestowed upon the Dallas Cowboys. It may go back to the Tom Landry days, a coach I respected ... but, as a long time Bronco fan, I resented that term every time some talking head sports announcer uttered the words. I'm sure Steeler, Raider, Packer fans, etc., felt the same way. Anytime I watch the Dallas Cowboys play I'm for the other team. Jerry Jones makes it easy.
I don't begrudge anyone having one non-conference team they hate, as long as there's a reason. However, the media invented the America's Team moniker, so I don't think it's fair to hold that against Dallas.
“It may go back to the Tom Landry days, a coach I respected ...”
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Tom Landry celebrated his 21st birthday piloting a bomber through flak over Germany. He was more than just a good coach.
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.