In his latest book, Jared Diamond examines the role of leaders in shaping history, challenging the widely held assumption that individuals exert outsized influence on historical outcomes. Drawing from examples ranging from medieval monarchs to modern-day figures, Diamond argues that structural factors such as geography, economics, and social conditions often overshadow the impact of a single person.
Diamond begins by revisiting the case of Henry V of England, who survived a severe arrow wound in 1403 and later led his nation to stability and military triumph at Agincourt in 1415. Yet, Diamond questions how much English history would have changed if Henry had died or never ruled, suggesting that broader forces, rather than individual decisions alone, tend to guide the course of events.
The author applies this skepticism to well-known leaders across history. He contends that figures like Jesus, Genghis Khan, and Adolf Hitler may have been products of their environments as much as architects of them. For instance, Jesus’s influence depended heavily on St. Paul’s missionary work and the context of the Roman Empire’s expansion, while Genghis Khan’s rise correlated with favorable climatic conditions rather than solely personal genius.
Diamond, known for his interdisciplinary work encompassing anthropology, ecology, and geography, proposes a novel method for assessing leadership impact: the “natural experiment.” Borrowed from social science, this approach compares similar historical circumstances where leadership differs, enabling an analysis of leaders’ tangible effects apart from broader trends.
However, Diamond’s reliance on natural experiments encounters methodological challenges throughout the book. Using royal inbreeding as a proxy for mental capacity and correlating it with territorial expansion, for example, yields mixed conclusions. He finds that monarchs with fewer constraints on their power demonstrate a stronger link between intelligence and political outcomes, but admits the evidence is far from conclusive.
The author also acknowledges that natural experiments cannot always account for unforeseen events like assassinations or sudden leadership changes, where subsequent developments may vary widely. While leaders can influence trajectories positively or negatively, Diamond finds their overall effect often averages out over time.
Case studies include politically notable leaders such as Seretse Khama of Botswana, credited with steering his country to prosperity in the latter half of the 20th century, and figures like Winston Churchill and Charles de Gaulle, whose wartime leadership merits recognition but is tempered by their historical context. In business and religion, Diamond examines innovators like Jeff Bezos alongside less consequential entrepreneurs, as well as spiritual leaders whose successes depended on a combination of charisma and favorable social conditions.
Diamond also explores sports coaching, where natural experiments might more clearly isolate leadership impact. Yet, even in these settings, he underestimates statistically significant differences—such as a 0.3-point per game advantage in soccer, enough to markedly shift a team’s league standing.
While Diamond’s ambitious attempt to blend sociological methods with historical analysis provides fresh perspectives, critics note the book’s conclusions often appear tentative or contradictory. Contrasting with other recent leadership studies, such as Henry Kissinger’s 2022 work that emphasizes the transformative agency of determined leaders, Diamond’s approach leans toward highlighting structural inevitability over individual decisiveness.
Ultimately, the book serves as a thought-provoking, if imperfect, meditation on the boundaries between human agency and larger historical forces, inviting readers to reconsider the extent to which leaders shape the world stage versus being shaped by it.