An example is that the English and Japanese, being Island Nations, would naturally have an advantage at sea combat. And, in an age of sea-trade they would, tend to be powerful. His thesis explicitly stated how the Frontier shaped the American mind to be open to new things and to strive for what was new. In our modern technological age, Americans are very open to new technologies. This thesis says that history is little more than mythmaking.
History is the history of winners.
Those who win, write the history books. Those who have lost are excluded or demonized. History is determined by who has the political power to write the books. Daniel J. Boorstin's books suggest a thesis that ideas and practices simply come together in various places and time and can hardly be predicted. What has mattered, is that the great Creators and Discoverers have been open to the challenge and took previously unrelated ideas and put them together in a way that was entirely new.