Ronald Reagan

He played a key role in securing the Montreal Protocol, an international environmental pact to protect the ozone layer by reducing the use of certain chemicals.

The fall of affirmative action is part of a 50-year campaign to roll back racial progress.

He persuaded Ronald Reagan to help defeat a proposed ban on L.G.B.T.Q. schoolteachers in California in 1978, and he sparred with his friend Bill Clinton over “don’t ask, don’t tell.”

The choice Jill Biden faces — promoting her husband’s ambition for a second term or protecting the legacy of his first term — can no longer be avoided.

Donald Trump didn’t remake the Republican Party. He merely restored the pessimistic, isolationist version from decades ago.

El principal logro del actual mandatario, según los historiadores encuestados, fue sacar a Donald Trump del Despacho Oval.

President Biden may owe his place in the top third to his predecessor: Mr. Biden’s signature accomplishment, according to the historians, was evicting Donald J. Trump from the Oval Office.

What qualifies someone to be president, anyway?

With museums, special exhibitions and unique events, presidential libraries across the country are designed as destinations for everyone — not just scholars or academics.

If Biden can’t convince enough voters that he is up to the presidency into his mid-80s, it doesn’t matter how the country feels about Trump.