It is Donald Trump's world now, and it is a lonelier place.

Twenty-four years ago, the first foreign leader to reach out to President George W. Bush in the wake of the catastrophic 9/11 attacks on New York and Washington was the new Russian president, Vladimir Putin, offering condolences and help. The NATO alliance invoked Article 5 for the first time, calling it an attack on them all.

Nearly every country in the world, from Argentina to the former Yugoslavia, declared that it stood with America.

Since then, the alliances forged in tragedy have been fractured by the long war in Iraq and upheaval in the Middle East, the revival of "America First" populism and the steepest U.S. tariffs in nearly a century, a transactional president and the passage of time.

That's not a surprise. Over a quarter-century, national interests shift and foreign alliances change.