In "Earning the Rockies," Robert D. Kaplan argues that while geography does not dictate a person’s character, it still plays a significant role in shaping perspectives and behaviors. The location where individuals live influences their experiences, opportunities, and values, which can lead to distinct regional identities. Kaplan emphasizes the importance of understanding geographic context when analyzing human interactions and socio-political dynamics.

Kaplan's exploration highlights the complex interplay between geography and culture, suggesting that while individuals have agency, the environments they inhabit inevitably affect their worldviews and choices. By examining America's diverse landscapes, he illustrates how geography can inform a nation's ethos and its global engagements, thus contributing to the broader discourse on international relations.