Just as characteristic, perhaps, is the intellectual interdependence created through the development of the modern media of communication: post, telegraph, telephone, and popular press.

The free trade movement in the middle of the last century represents the first conscious recognition of these new circumstances and of the necessity to adapt to them.

Modern techniques have torn down state frontiers, both economical and intellectual. The growth of means of transport has created a world market and an opportunity for division of labor embracing all the developed and most of the undeveloped states.

Christian Lous Lange Quotes