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... President Trump has delivered a series of hammer blows to an international order that America largely built, buttressed, and led in the decades after World War II. Its dominant influence ranged from trade, through defense, to economic development and, more often than not, to the promotion of democracy and human rights.

In place of the American "exceptionalism" embraced for years by presidents of both parties, Mr. Trump has positioned the United States as a lone wolf: still the world's wealthiest and most powerful country, but shedding commitments and relationships that do not directly serve its own political and economic interests.

"About time!" has been the response from two very different constituencies: domestic supporters of his "America first" message, and Washington's principal rivals overseas, China and Russia.

They have long bristled at America's outsized international footprint, pushing instead for a multipolar world in which they would share influence with Washington. ...