"In a series of articles and speeches, which were summarized in his best known publication, The Central Gold Region: The Grain, Pastoral and Gold Regions of North America (1860), Gilpin argued that the development of the interior of the continent, made possible in large part by a properly-sited transcontinental railroad, would create a new and dominant commercial line of communication between Europe and Asia. This would inaugurate a new era in human affairs focused around what would become the greatest civilization in history, the Republican Empire of North America"--Classics of Strategy and Diplomacy website.