US Grand Strategy in the 21st Century: The Case For Restraint - Paperbackby A. Trevor Thrall (Editor), Benjamin H. Friedman (Editor) This book challenges the dominant strategic culture and makes the case for restraint in US grand strategy in the 21st century. Grand strategy, meaning a state's theory about how it can achieve national security for itself, is elusive. That is particularly true in the United States, where the division of federal power and the lack of direct security threats limit consensus about how to manage