There are a lot of 49ers fans around the country because they had a big run there in the 80's and 90's. So if people were growing up at that time a lot were 49ers fans. Because kids often like the real good team and follow it. They also have cool uniforms. The red and gold just looks really good. Compared to say the Browns who have an ugly uniform. Yes kids really choose teams like this.
The Cowboys always marketed like Americas team and would go into places next door like New Mexico. Who didn't have a team and said Dallas and TX teams are your team. Then they expanded it out to many other states. The built a big following. That was actually a goal of one of the previous owners. Not sure about Jerry Jones. But they used to market that way on purpose under a prior owner. Probably for merchandise sales. They just wanted to build a bigger following and it worked.
The Dallas Cowboys have leveraged the America's Team moniker to build their story — crafting a brand with innovation, investment, and success on the field.
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