"The Sunbelt boom of the late 1970s paralleled the popularization of country music and auto racing; the expansion and relocation of professional sports franchises into the region; and even the country's mythical love affair with the National Football League's Dallas Cowboys, dubbed 'America's Team' in 1976. In sum, the Sunbelt became fashionable in the 1970s."-Source: Sean P. Cunningham, historian, American Politics in the Postwar Sunbelt: Conservative Growth in a Battleground Region, 2014The excerpt best illustrates which of the following developments?

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