Freedom of the seas is the foundation of all sea power and a bedrock principle of international law and global order. Separated from the centers of power in Europe and Asia by the Atlantic and Pacific Oceans, the United States has relied on the principles of freedom of navigation for economic prosperity and military security. James Kraska and Raul Pedrozo focus on the struggle to safeguard that freedom. Challenges to U.S. warships and maritime commerce have pushed, and continue to challenge, the United States to vindicate its rights through diplomatic, legal, and military means, underscoring the need for the strategic resolve to ensure freedom in the global maritime commons.