Because: If the vote in the other Republican or Democratic states is as expected, the election victory will depend on the vote in the swing states. The political majorities in the swing states often decide practically at the last moment and based on a few votes. This is due to an unusually high number of swing voters. Within the swing states, there are also individual areas in which support for the Republicans or Democrats is particularly variable
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However, which states are declared swing states varies from election to election. What is important is whether surveys and observers show no clear tendency in the direction of one of the political camps. However, some states, including Arizona, continue to appear on the list of swing states. There are also states along the Rust Belt, the former center of the steel industry in the USA, that have been considered swing states for several years. This has to do with the collapse of formative and identity-forming industries, but also with a changing age structure of the electorate. In the 2016 US election campaign, for example, Trump scored points in the previously democratic region with his promise to revitalize the Rust Belt.