Henry George

If to prevent trade were to stimulate industry and promote prosperity, then the localities where he was most isolated would show the first advances of man. The natural protection to home industry afforded by rugged mountains-chains, by burning deserts, or by seas too wide and tempestuous for the frail bark of the early mariner would have given us the first glimmerings of civilization and shown its most rapid growth. But, in fact, it is where trade could best be carried on that we find wealth first accumulating and civilization beginning. It is on accessible harbors, by navigable rivers and much traveled highways that we find cities arising and the arts and sciences developing.

– Henry George, Protection or Free Trade [1886]