A succession of U.S. presidents pursued global expansion, resulting in about 750 American military bases today in at least 80 countries. Even Biden reportedly sought to acquire a Bangladeshi island in the Bay of Bengal. But Trump is unique in articulating his expansionist goals openly.

By Brahma Chellaney, The Hill

President Trump’s second term is proving even more disruptive than his first, especially for the world order.

In under 100 days, he has upended international norms, challenged key alliances and reasserted American power with blunt confidence. The emerging pattern reveals something deeper: a revival and global extension of the 19th-century Monroe Doctrine.

First declared in 1823 by President James Monroe, the Monroe Doctrine sought to prevent European powers from meddling in the Americas. Its premise was simple: The Western Hemisphere was a U.S. sphere of influence.

Under Trump, this idea is being reinterpreted, expanded and aggressively enforced — not just in the Americas but across the broader Western world.

Trump first cited the Monroe Doctrine in a 2018 speech at the United Nations, calling it “the formal policy of our country.” Now in his second term, he has moved from rhetoric to implementation. His administration has not only reasserted U.S. dominance in Latin America but is also reshaping relations with Europe, Africa, Asia, Australia, Canada and Arctic territories in ways that suggest a new, hemispherically-unbound version of American primacy.

Nowhere is this shift more evident than in Trump’s trade policy. He has weaponized tariffs — not just as bargaining tools, but as permanent instruments of economic nationalism. The Trump administration views protectionism not as a temporary phase but as a structural pillar of American renewal. Tariffs, in this framework, are both revenue generators and geopolitical levers, including against allies.

Trump’s ambitions extend well beyond trade. He has flirted openly with territorial expansion, expressing interest in acquiring Greenland, taking over the Panama Canal and even calling the U.S.-Canada border “an artificial line of separation.” He has also floated the idea of permanently resettling the entire population of Gaza, some 2 million people, in nearby Muslim countries so that the U.S. could take over the Strip and develop it into “the Riviera of the Middle East.”

Such proposals echo the Manifest Destiny ethos of the 19th century — a belief in America’s God-given right to expand its control and reach across land and sea.

In his inaugural address, Trump explicitly evoked Manifest Destiny, framing American expansion as a natural and noble pursuit. “The U.S. will once again consider itself a growing nation — one that increases our wealth, expands our territory, builds our cities, raises our expectations, and carries our flag into new and beautiful horizons,” Trump declared. He cited President William McKinley, who annexed the Philippines and Puerto Rico, as a model for coupling tariffs with U.S. expansion.

The message is clear: Trump sees America not just as a global power, but as an entitled hegemon.

To be sure, Trump is not the first post-World War II U.S. president pursuing American expansion. It was because of his predecessors’ global expansion that there are about 750 U.S. military bases today in at least 80 countries. Even the Biden administration reportedly sought to acquire from Bangladesh a strategic island in the Bay of Bengal — an effort that then-Prime Minister Sheikh Hasina claimed contributed to her overthrow last August.

But Trump is unique in his openness. He articulates his expansionist goals without diplomatic euphemism, often with provocative bluntness that shocks allies and adversaries alike.

One of the starkest expressions of this worldview is Trump’s treatment of America’s traditional alliances. He sees allies free-riding on American security and exploiting U.S. generosity, regarding them as leeches on the American economy. He views NATO not as a mutual defense pact but as a burdensome arrangement whereby the U.S. foots the bill for ungrateful allies.

Nowhere is the transatlantic divergence more visible than in the Ukraine war. While Europe remains fixated on the Russian threat, Trump wants to end what he calls the “savage conflict” and reset relations with Moscow. China is significantly stronger than Russia in economic output, military spending and other strategic metrics, and the Trump administration’s leaked defense guidance calls China “the sole pacing threat.”

Trump’s pivot from Europe to the Indo-Pacific region will represent a major reallocation of American attention and resources. The goal is to free up bandwidth for countering China’s aggressive rise — even if that means leaving Europe to manage Russia largely on its own. This marks the first time since 1945 that the U.S. has considered pulling back from its European security commitments to focus elsewhere.

But perhaps most revealing is how Trump’s foreign policy now resembles an updated Monroe Doctrine extended to the entire Western world. His bid to buy Greenland, a NATO territory under Danish control, symbolizes this shift. Greenland is far from the Americas, but its Arctic position makes it a strategic asset — and a candidate, in Trump’s eyes, for U.S. acquisition.

In this reimagined doctrine, the West is no longer a community of shared values, but a zone of expected compliance under American leadership.

This ideological shift reframes the Monroe Doctrine from a hemispheric defense policy to a global framework of dominance. Trump is not merely reviving an old doctrine — he is globalizing it. Under “Monroe 2.0,” the Western world is to be managed, not merely defended, by Washington. This is set to transform all of America’s long-standing alliances.

As the “Trump Revolution” unfolds, allies and rivals alike are being forced to recalibrate. If this new doctrine persists, the world could face not just a reassertion of American power but a redefinition of the West itself, with the U.S. as both guardian and gatekeeper.

Brahma Chellaney is a geostrategist and the author of nine books, including the award-winning “Water: Asia’s New Battleground.”