Many assumed that Donald Trump’s second term as president of the United States would turn out like his first. But this time looks to be different. In his opening weeks, the US president has taken a flurry of actions he never attempted before, wielding sweeping tariffs against the US’s neighbors, upending portions of the federal workforce, and attempting to change constitutionally enshrined citizenship laws through executive order.The early signs on foreign policy are no exception. In his inaugural address, Trump said next to nothing about the issues that have dominated US foreign policy for decades – matters of war and peace in Asia, Europe and the Middle East. Instead, he spoke of expanding US territory in the western hemisphere (and going to Mars), harking back explicitly to the 19th-century tradition of manifest destiny. Astoundingly, Trump mentioned China solely for the purpose of accusing it, inaccurately, of operating the Panama canal. When he turned beyond the Americas, Trump’s most telling line signaled restraint: “We will measure our success not only by the battles we win but also by the wars that we end – and perhaps most importantly, the wars we never get into.”Then Marco Rubio, the secretary of state, made even more pointed and intriguing remarks. Rubio ran for president in 2016 vowing to usher in a “new American century”, the mantra of post-cold war neoconservatives. But days ago, sitting for his first lengthy interview as America’s chief diplomat, he emphasized the need for a foreign policy grounded in the US national interest and said:“So it’s not normal for the world to simply have a unipolar power. That was not – that was an anomaly. It was a product of the end of the cold war, but eventually you were going to reach back to a point where you had a multipolar world, multi-great powers in different parts of the planet. We face that now with China and to some extent Russia, and then you have rogue states like Iran and North Korea you have to deal with.”For a US secretary of state to announce that the world is now “multipolar”, or is inevitably heading in that direction, is historically significant. Hillary Clinton also used the m-word in 2009 at the start of her tenure in the same role, but she invoked it less than affirmatively: Clinton professed a desire to move “away from a multipolar world and toward a multipartner world”. Rubio, by contrast, meant that a world of multiple poles or powers is to be accepted, not resisted. He also implied that US foreign policy had long been off course, having taken unrivaled American dominance to be a normal or necessary condition when in fact it was destined to disappear. At the end of the cold war, Rubio explained: “We were the only power in the world, and so we assumed this responsibility of sort of becoming the global government in many cases, trying to solve every problem.”The message: no longer.Still, no longer could lead down any number of roads. Read against the Trump administration’s Americas-centric start, Rubio’s comments have provoked dread – or excitement, depending on the perspective – that the United States will radically reduce its political-military role beyond the western hemisphere even as it asserts its power within the Americas.For traditional figures in Washington, the fear is that Trump 2.0 will give China and Russia a free hand to command “spheres of influence” in their regions, so long as they permit the United States to police its own sphere. For advocates of US restraint overseas, the hope is that Trump will deliver on his promises to end the wars in Ukraine and the Middle East, shift more responsibility for defending Europe on to the shoulders of European allies, and seek to find a stable if competitive mode of coexistence with China. If Rubio thinks the world is now multipolar, presumably it follows that the United States should abandon the approach it pursued in the bygone age of unipolarity – a grand strategy of “primacy” or “hegemony”, as scholars call it.Perhaps. Rubio, though, was not nearly so conclusive. Throughout the interview, he referred to the governments in Moscow and Beijing in adversarial terms, which hardly suggest a willingness to grant them spheres of influence. Nor is there a straight line from acknowledging the loss of unipolarity to abandoning primacy. Even in a crowded, competitive landscape, the United States could try to remain militarily stronger than every rival, retain all its globe-spanning defense commitments, and maintain a large troop presence in Asia, Europe and the Middle East simultaneously. Those are the elements of primacy. Rubio did not renounce any of them. The United States, in short, could still pursue primacy without enjoying unipolarity.Indeed, in associating multipolarity with the existence of “multi-great powers”, Rubio may have meant to affirm the outlook of the first Trump administration, which adopted “great power competition” as a watchword. For Trump 1.0, as for the Biden administration that followed, the rise of China and the assertion of Russia did not compel Washington to pare back its military commitments and presence. Quite the contrary. Over the two presidencies, Nato enlarged to four new countries, the US military presence in the Middle East (excluding Afghanistan) remained stable, and the United States deepened security cooperation with Ukraine, Taiwan and others.So far, the appearance of formidable rivals has done less to discipline US ambitions than to furnish US global primacy with a new rationale – to stand up to the aggressive and revisionist activities of America’s adversaries. As Rubio put it: “China wants to be the most powerful country in the world and they want to do so at our expense, and that’s not in our national interest, and we’re going to address it.”But Rubio did signal more restraint than a continuation of business as usual. Just after his remarks on multipolarity, he noted that the second world war ended 80 years ago and that “if you look at the scale and scope of destruction and loss of life that occurred, it would be far worse if we had a global conflict now.” Since the end of the cold war, US leaders have invoked the second world war almost exclusively to exhort the country to lead the world. Rubio, by contrast, did so to caution against the dangers of overreach. He continued:“You have multiple countries now who have the capability to end life on Earth. And so we need to really work hard to avoid armed conflict as much as possible, but never at the expense of our national interest. So that’s the tricky balance.”Quite so. In recent years, the risk of conflict between major powers has grown acute. The war in Ukraine – in which one major power is fighting directly on its borders and the other heavily arming its opponent – had no parallel during the cold war. A US-China military conflict over Taiwan would be ruinous. In a country unused to paying noticeable costs for foreign policy choices, and a world that no longer remembers the last general war, Rubio delivered a salutary message.The policy test, however, is still to come. If the new administration is serious about avoiding catastrophic wars, without exposing core US interests to great power predation, it will make a determined, sustained diplomatic effort to end the war in Ukraine and minimize the risks of escalation if initial talks do not succeed. It will explore politically difficult ways to reach a modus vivendi with China, including by offering assurances that the United States does not seek to keep Taiwan permanently separate from the mainland, a red line for Beijing.The new administration’s opening moves suggest some intention to find a more sustainable and less confrontational approach toward the world’s major powers. But if unipolarity is dead, the lure of primacy remains very much alive.
Stephen Wertheim is a senior fellow in the American statecraft program at the Carnegie Endowment for International Peace and a visiting lecturer at Yale Law School and Catholic University More
