In "Earning the Rockies," Robert D. Kaplan argues that America's historical trajectory has been significantly influenced by its geography. He suggests that the geographic features of the continent have not only shaped the nation's development but have also positioned it as a natural leader on the global stage. Over the past 250 years, these geographic advantages have allowed the U.S. to expand and establish itself as a dominant power.

Kaplan emphasizes that America's geographical positioning provides it with unique opportunities and challenges that have played a crucial role in defining its international role. As the country navigates its future, understanding these geographical influences becomes essential for understanding its leadership in the world.