Many have read Barone's piece on changing American demographics and the Interior Boomtowns. If not, a quote:
The nation's center of gravity is shifting: Dallas is now larger than San Francisco, Houston is now larger than Detroit, Atlanta is now larger than Boston, Charlotte is now larger than Milwaukee. State capitals that were just medium-sized cities dominated by government employees in the 1950s--Sacramento, Austin, Raleigh, Nashville, Richmond--are now booming centers of high-tech and other growing private-sector businesses. San Antonio has more domestic than immigrant inflow even though the border is only three hours' drive away. The Interior Boomtowns generated 38% of the nation's population growth in 2000-06.
Read the whole thing.