What kind of policy can the United States pursue that ensures its security while minimizing the likelihood of war? We describe and defend a realist theory of foreign policy to guide American decision makers. Briefly, the theory says that if they want to ensure their security, great powers such as the United States should balance against other great powers. They should also take a relaxed view toward developments involving minor powers and, at most, should balance against hostile minor powers that inhabit strategically important regions of the world. We then show that had the great powers followed our theory's prescriptions, some of the most important wars of the past century might have been averted. Specifically, the world wars might not have occurred, and the United States might not have gone to war in either Vietnam or Iraq. In other words, realism as we conceive it offers the prospect of security without war. At the same time, we also argue that if the United States adopts an alternative liberal foreign policy, this is likely to result in more, rather than fewer, wars. We conclude by offering some theoretically-based proposals about how US decision makers should deal with China and Iran.
When do leaders resort to deception to sell wars to their publics? Dan Reiter and Allan Stam have advanced a “selection effects” explanation for why democracies win the wars they initiate: leaders, because they must secure public consent first, “select” into those wars they expect to win handily. In some cases, however, the “selection effect” breaks down. In these cases, leaders, for realist reasons, are drawn toward wars where an easy victory is anything but assured. Leaders resort to deception in such cases to preempt what is sure to be a contentious debate over whether the use of force is justified by shifting blame for hostilities onto the adversary. The events surrounding the United States' entry into World War II is useful in assessing the plausibility of this argument. President Franklin Roosevelt welcomed U.S. entry into the war by the fall of 1941 and attempted to manufacture events accordingly. An important implication from this finding is that deception may sometimes be in the national interest.
What is the relationship between insularity—a state’s separation from other states via large bodies of water—and expansion? The received wisdom, prominent in (though not exclusive to) realist theories, holds that insularity constrains expansion by making conquest difficult. We contend, by contrast, that this received wisdom faces important limits. Focusing on U.S. expansion via means short of conquest, we interrogate the underlying theoretical logics to demonstrate that insular powers enjoy two distinct advantages when it comes to expansion. First, insularity translates into a “freedom to roam”: because insular powers are less threatened at home, they can project more power and influence abroad. Second, insularity “sterilizes” power, which explains why insular powers are seen as attractive security providers and why we do not see more counterbalancing against them. On net, existing scholarship is correct to argue that insularity impedes conquest between great powers. Still, it has missed the ways that insularity abets expansion via spheres of influence abroad. One consequence is an under-appreciation for the role of geography writ large and insularity in particular in shaping contemporary great power behavior.
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