21 April 2025

The Age of American Unilateralism

Michael Beckley

Since the end of the Cold War, the United States has largely been expected to follow one of two foreign policy paths: preserve the country’s position as the leader of the liberal international order or withdraw and adjust to a post-American, multipolar world. But as I argued in Foreign Affairs in 2020, the most likely trajectory was always a third: become a rogue superpower, neither internationalist nor isolationist but aggressive, powerful, and increasingly out for itself.

U.S. President Donald Trump has given this vision sharp definition by raising tariffs to levels that echo the infamous Smoot-Hawley Act of 1930, slashing foreign aid, snubbing allies, and proposing to seize foreign territory, including Greenland and the Panama Canal. Yet Trump is more accelerant than architect, channeling long-simmering frustrations with global leadership and deeper structural forces pulling U.S. strategy inward. The real question now is not whether the United States will continue to go its own way but how—and to what end.

Understanding the drivers of this shift is no longer a matter of academic debate. It’s essential for shaping what comes next. Left unchecked, Washington’s unilateral turn could destabilize the world and undermine its own long-term power. But if recognized and redirected, these forces could form the foundation of a more focused and sustainable strategy; one that sheds the overreach of liberal hegemony without surrendering the core strengths of a liberal order.


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