Biden declares the era of Trump-style ‘America First’ diplomacy over.

For anyone looking for evidence that boasts about “America First” — and the need for America to go-it-alone — are over, President Biden’s speech to the Munich Security Conference was meant as an opening argument.

“America is back, the trans-Atlantic alliance is back,” Mr. Biden declared. Trying to expunge the last four years without ever once naming his predecessor, Donald J. Trump, Mr. Biden said “we are not looking backward.”

And then he went on to offer a 15-minute ode to the power of alliances.

He talked about an America...