Members of the foreign policy world have talked a lot about great-power competition over the last decade. But no one can entirely agree on the contours of today’s competition. Whether it’s a battle of autocracies and democracies. Or revisionists and status quo powers. Or whether, as the realists would argue, it’s just states doing what states do.  S. C. M. Paine, a longtime professor of strategy and policy at the U.S. Naval War College, sees something else going on. To her, the great-power competition we talk about today is just the latest example of the centuries-old tension between maritime and continental powers. For maritime powers—such as, for most of its history, the United States—money and trade serve as the basis of influence. And that leads them to promote rules and order. Continental powers—such as Russia most clearly and China in most but not all ways—focus their security objectives on territory, which they seek to defend, and control, and expand. From this divide rises two very different visions of global order. It also, Paine argues in a new essay in Foreign Affairs, explains the basic drivers of today’s great-power competition. But as she looks at more recent developments, Paine lays out an additional concern. The United States has long been an exemplar of maritime power. But it is starting to behave in ways that suggest a shift away from the maritime strategies that have served it so well. Paine’s focus on the contest between land and sea makes clear the stakes of that shift. You can find sources, transcripts, and more episodes of The Foreign Affairs Interview at https://www.foreignaffairs.com/podcasts/foreign-affairs-interview.