Michael Kazin (born June 6, 1948) is an American historian, and professor at Georgetown University. He is co-editor of Dissent magazine.[1][2][3] (wikipedia)
Once the majority of Americans became middle class, once their jobs ceased to be manual jobs, then they began to look around and choose to live in a place, in part, because of the weather.
It's a war only because we've got the rhetoric of wartime.
The Sun Belt would not have become such a dynamic, urban, industrial region if it hadn't been for air conditioning. Before 1945, before the 1950s, the South was a pretty sleepy area, industrially.
Americans have wanted to move to places where the weather fit their clothes, as the old saying goes, where you could live an athletic life year-round.