Chapter 7 examines the nexus between trade and security in the transatlantic alliance, focusing on recurring controversies over sea power in Anglo-American relations. While the setting and enforcement of rules were once principally the responsibility of the United Kingdom, with the United States often acting as a free-rider and antagonist, their respective roles have since been reversed. This can be seen in the related topics of the rights of neutrals in wartime and the protection and promotion of maritime shipping. In addition to chronicling the historical role-reversal on these issues, the chapter also highlights how the US approach to hegemony differs from that of its predecessor. Those differences may be traced to a lesser degree of trade-dependence, which gives Washington more leeway than London had in privileging power over wealth in the rules that it seeks to devise and enforce.