What are the media capitals within the United States? Why are these locations CAPITALS for media?

Question

The informed argument says Richmond, Virginia, but it doesn't say why.

Answer 1

One suspects that cities with the greatest population in certain sections of America would be their major media markets, provided the media in those cities sought to be ♦national♦ media; the Seattle Post-Intelligencer might be a good newspaper, but one considers it a regional paper.

In addition to New York and Los Angeles, one suspects Atlanta (because of CNN) is the next big media capital; Chicago might be next, but merely due to its population.