For over 75 years, the North Atlantic Treaty Organization has bolstered American power and shaped the world order as we know it. But under President Donald Trump, its future is uncertain.

The United States has spent the better part of a year telling its allies they’re on their own. Trump has threatened to annex Greenland – the sovereign territory of NATO ally, Denmark. He skipped the Munich Security Conference. And he launched the war in Iran without consulting NATO allies.

Now, the president is asking for help securing the Strait of Hormuz. And European countries are saying no.

How is the war in Iran testing the alliance? And how would a U.S. withdrawal from NATO reshape global power dynamics?

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