Origin and History of Frontiers - Influence of frontiers in the history of the modern world

I would invite you to pause and consider what Frontiers mean, and what part they play in the life of nations. It was the adoption of a mistaken Frontier policy that brought the colossal ambitions of the great Napoleon with a crash to the ground. The allied armies might never have entered Paris had the Emperor not held out for an impossible Frontier for France. The majority of the most important wars in the history have been Frontier wars.
To take the experience of the past half-century alone. The Franco-German War was a war for a frontier ...