The Art of Tetman Callis

“In these three things—production, with the necessity of exchanging products, shipping, whereby the exchange is carried on, and colonies, which facilitate and enlarge the operations of shipping and tend to protect it by multiplying points of safety—is to be found the key to much of the history, as well as of the policy, of nations bordering upon the sea.” – Captain A. T. Mahan, The Influence of Sea Power Upon History 1660-1783