This book explores fundamental questions about grand strategy, as it has evolved across generations and countries. It provides an overview of the ancient era of grand strategy and a detailed discussion of its philosophical, military, and economic foundations in the modern era. The author investigates these aspects through the lenses of four approaches - those of historians, social scientists, practitioners, and military strategists. The main goal is to provide contemporary policy makers and scholars with a historic and analytic framework in which to evaluate and conduct grand strategy. By providing greater analytical clarity about grand strategy and describing its nature and its utility for the state, this book presents a comprehensive theory on the practice of grand strategy in order to articulate the United States' past, present, and future purpose and position on the world stage.