In a recent visit to Greece, the secretary of state suggested that Europe must rediscover the values of conquest and expansion

They had obviously worked hard on the backdrop – and it was magnificent. On 7 October, the US secretary of state, Marco Rubio, delivered a major speech in Athens, outdoors, with the Acropolis behind him. The sun was setting, bathing the ancient scene, including the Parthenon, in the light of the golden hour.

The golden hour, but yet not quite the golden age. This was not Pericles defending democracy. Instead, Rubio offered a haunting vision of the choices facing the west, arguing that the US and Europe must rediscover the values of exploration and conquest that once drove centuries of expansion, or face decline and irrelevance.

We appear to be entering a new era, in which political desperation at home leads to increasingly unhinged threats abroad

Donald Trump was in Nebraska on Monday, and though his long rally speech had elements of a performance, this was no Bruce Springsteen album. He offered another dark meditation on a world spiraling out of control, one in which the destruction of American cities is increasingly a possibility, unless Americans trust him to use the vast powers of the presidency to annihilate his foes.

The president drew fury when he suggested that Iran could launch a nuclear attack and “take out” Los Angeles or San Diego. California leaders reacted with scorn at Trump’s alarmism.

Ted Widmer, a former White House speechwriter, is the editor of American Speeches, and the recently published The Living Declaration: A Biography of America’s Founding Text, both published by the Library of America