The connection between culture and power is seems to have been taken for granted in the ancient world(s): Plato, Aristotle and Confucius all wrote extensively on the importance and the influence of culture (considered broadly) in the political realm.
America's Danger of Imperial Overstretch Bloomberg News. https://www.bloomberg.com/opinion/articles/2016-07-13/america-s-in-danger-of-imperial-overstretch
Books by the American historian Chalmers Johnson. http://americanempireproject.com/authors/chalmers-johnson/