On day one, he put the world on notice.
Nothing will stand in our way, President Donald Trump declared, to thunderous applause, as he ended his inauguration speech in a cold Washington winter on this day last year, at the start of his second term.
Did the world fail to take enough notice?
Tucked into his speech was a mention of the 19th Century doctrine of manifest destiny – the idea that the US was divinely ordained to expand its territory across the continent, spreading American ideals.
Now that same declaration, expressed with absolute resolve, is directed at Greenland.
US history is littered with consequential and controversial American invasions, occupations, and covert operations to topple rulers and regimes. But, in the past century, no American president has threatened to seize the land of a longtime ally and rule it against their people's will.
There's little doubt that old rules are being broken, with impunity.
Trump is now being described as possibly the US's most transformative president - cheered by supporters at home and abroad, alarm among others in capitals the world over.
There's mounting concern over a possible painful trade war, even worry in some circles that the 76-year-old NATO military alliance could now be at risk if, in the worst case scenario, the US commander-in-chief tries to take Greenland by force.
Trump's defenders are doubling down in support of his America First agenda, against the post-war multilateral order.
How do America's anxious allies respond, when it seems nothing will stand in Trump's way?
Many phrases have peppered this past year of diplomatic contortions over how best to deal with the US's unpredictable president and commander-in-chief.
Trump's astonishing threat to annex his neighbour to the north surfaced again this week in a post on social media.
Canadians know there's still a risk they could be next.
As allies navigate this politically slippery terrain, Trump's ability to reshape international norms stands as the central question of our time.
