One year into Donald Trump’s second term it is clear that US foreign policy has taken a radical turn from anything seen in the previous 80 years. After the second world war, a system of treaties and alliances saw the US commit to upholding international institutions, rules and laws, as well as promote global prosperity through free trade and market access.

But these things are all antithetical to Trump’s foreign policy vision. Trump appears committed to the abandonment of this longstanding foreign policy stance and to the abdication of his country’s leadership role at the top of the international system. In fact, he seems intent on destroying many of the tenets and institutions of this system and replacing it with an altogether different vision of international relations.

With a background in real estate, Trump sees the world through a transactional lens. He appears to see alliances as a financial burden and a source of security vulnerability, and considers an open trading system to be unfair to the US as the world’s largest market. Trump also seems to find dealing with democracies more burdensome than bargaining with autocratic rulers. For him, the global system of liberal rules and institutions simply acts to prevent the US from using its power to........

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