Is offshore balancing the right grand strategy for America? Is it time for Washington to roll back the vast system of overseas security commitments and forward military deployments that have anchored its international posture since World War II? This monograph argues that the answer to these questions is no. Offshore balancing represents the preferred grand strategy among many leading international-relations “realists,” who argue that significant geopolitical retrenchment can actually improve America’s strategic position while slashing the costs of its foreign policy. The reality, however, is rather different. The probable benefits of offshore balancing—both financial and geopolitical—are frequently exaggerated, while the likely disadvantages and dangers are more severe than its proponents acknowledge. In all likelihood, adopting this strategy would not allow America to achieve more security and influence at a lower price. The more plausible results would be to dissipate U.S. influence, to court heightened insecurity and instability, and to expose the nation to greater long-range risks and costs.