A new study by Jared Diamond examines the role of individual leaders in shaping the course of history, questioning the extent to which their impact is often overstated. Drawing from a wide range of historical examples, Diamond argues that leadership frequently matters less than commonly believed, as broader structural forces frequently shape outcomes more decisively than individual agency.
Diamond’s investigation begins with the example of King Henry V of England, who survived a severe head wound in 1403 and later led his country to military and political success. Yet he poses a counterfactual: had Henry died or been replaced by one of his brothers, would English history have changed significantly? Diamond’s conclusion is largely negative, suggesting that changes in individual leadership often do not drastically alter the trajectory of civilizations.
The study spans a range of leaders, including Jesus Christ, Genghis Khan, and Adolf Hitler. Diamond contends that each succeeded not solely because of their personal qualities but also due to larger historical, geographic, and social forces. For instance, Jesus’s influence was amplified by figures like St. Paul and the expansive Roman Empire, while Genghis Khan’s rise coincided with favorable climatic conditions. Regarding Hitler, Diamond questions the inevitability of his specific leadership, noting that prior to his rise, his life offered no clear indications of his future role.
As an interdisciplinary scholar known for his previous work emphasizing environmental and geographical factors in human history, such as in “Guns, Germs, and Steel,” Diamond approaches leadership through a similar lens of structural causality. However, in his latest work, he proposes a novel methodology—applying “natural experiments” from social sciences to historical analysis—to better evaluate the actual impact of leaders. Natural experiments exploit circumstances where historical events allow for comparative analysis, akin to controlled studies in economics or medicine.
Diamond tests this method by examining royal families with high levels of inbreeding, which he associates with mental impairment, and correlates this with territorial expansion and political achievements. He further notes that under less constrained monarchies, a ruler’s intelligence appears to have a greater effect on outcomes, suggesting some leaders do indeed matter. Nonetheless, the method reveals significant limitations. For example, when a leader is assassinated or narrowly survives such attempts, the ensuing impact on political outcomes is often neutralized over time, as successors may be either more or less effective.
The author explores additional historical figures such as Seretse Khama of Botswana and mid-20th-century leaders like Winston Churchill and Charles de Gaulle, attributing their successes both to personal agency and favorable timing. In evaluating contemporary figures like Amazon founder Jeff Bezos or more obscure innovators in consumer goods, Diamond acknowledges varying scales of influence, highlighting the complexity of measuring leadership impact consistently.
Religious leadership is also scrutinized, with figures such as Muhammad, Joseph Smith, and Jim Jones analyzed through Diamond’s framework. While charismatic and organized religious leadership is recognized, Diamond emphasizes that broader economic and demographic factors are typically required for lasting influence.
Diamond extends his analysis to the realm of sports, where natural experiments appear most applicable. He evaluates coaching effectiveness in German soccer, though critics highlight that even seemingly small advantages in points per game can translate into significant competitive differences.
Ultimately, while Diamond’s work raises important questions about leadership’s historical role and proposes innovative analytical approaches, his conclusions remain cautious and sometimes inconclusive. His study offers a nuanced perspective emphasizing the interplay between individual agency and larger structural forces, though it stops short of delivering definitive answers. Other recent works, such as Henry Kissinger’s 2022 book on leadership, adopt a more assertive stance on the transformative potential of key historical figures and may provide firmer ground for those seeking to understand the power of leadership.