The NFL played six games on Thanksgiving in 1920. The holiday tradition apparently didn't settle in until 1934, the year the Detroit Lions were born. Back then, the Lions were just looking for a way to take some attention from the Detroit Tigers, who were so popular that new football owner George A. Richards thought he needed a diversion even though it was baseball's offseason. The game against Chicago was a big success, so the Lions have played on Thanksgiving ever since, save for a six-year gap during World War II. The Dallas Cowboys were invited to join them in 1966.
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