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Many accounts of the formation of American and British grand strategy during World War II between the fall of France and the Pearl Harbor attacks stress the differences between the two sides’ strategic thinking. These accounts argue that while the Americans favored a 'direct' Germany-first approach to defeating the Axis powers, the British preferred the 'indirect' or 'peripheral' method. However, a review of Anglo-American strategic planning in this period shows that before official U.S. wartime entry, both sides largely agreed the British 'peripheral' approach was the wisest grand strategy for winning the war.

When the U.S. military trains other states’ forces, it tries to impart liberal norms such as respect for human rights. But when liberal norms clash, these soldiers prioritize loyalty to their unit, the military, and shared goals.

Rather than revolutionizing war, drones demonstrate its evolution. The principle of air warfare remains avoiding exposure to the enemy. Drones are unlikely to shift the offense-defense balance toward the offense because they are vulnerable to attacks from the ground and air.

Modern states recurrently buttress their militaries with legionnaires—soldiers who are neither citizens nor subjects of the governments for which they fight. Legionnaire recruitment is a function of political constraints on a government's ability to enlist citizens and its perceptions of external territorial threats.

Military operations lie at the center of international relations theory and practice. Campaign analysis is a method involving the use of a model and techniques for managing uncertainty to answer questions about military operations and consists of six standard steps.

Since the end of World War II, nation-states in international conflict have made concerted efforts to restrain the weaponization of water. Distinct from realist and rationalist explanations, the historical record reveals the rise of an international normative inhibition—a “water taboo”—on using water as a weapon.

When aligned states consider disclosing secret information about military plans to use force, the state initiating these plans may choose among four information-sharing strategies: collusion, compartmentalization, concealment, and lying. Three main considerations shape its decision: potential costs of deception, the partner’s intentions, and the partner’s capabilities.

When and why do rising states prey upon or support declining powers? A state’s choice of policy toward a declining power depends on two factors: whether that power is useful against challengers to the rising state, and the declining state’s military strength.

In his new book, Do Morals Matter? Presidents and Foreign Policy from FDR to Trump, Joseph S. Nye developed a scorecard to determine how U.S. presidents since 1945 factored questions of ethics and morality into their foreign policy. In an interview, Henry Farrell asked him a few questions to get to the heart of his findings.

The arguments in favor of the United States' declaring that the only purpose of its nuclear weapons is to deter others who possess them from using theirs — in other words, that in no circumstances will this country use nuclear weapons first — are far stronger than the arguments against this stance. It must be hoped that the next US administration will take this no-first-use step promptly.