Good morning. A political earthquake rumbled across the globe, and the aftershocks are still being felt nearly one year later: Donald Trump’s inauguration. More on that below, plus fixing cellphone dead zones and renovating the most famous tropical greenhouse. But first:

• Canada reaches a tariff deal with China on electric vehicles, canola and other products
• A Canadian has been killed at the hands of Iranian authorities , foreign minister Anita Anand confirms
• European troops arrive in Greenland as a show of support after talks with the U.S. end in “fundamental disagreement”

Hi, I’m David Shribman, I write U.S. political analysis for The Globe and Mail and am the executive editor emeritus of the Pittsburgh Post-Gazette.

Next week represents an important reckoning: Tuesday marks the one-year anniversary of the inauguration of Donald Trump. But no one needs an anniversary to realize that the past year, Trump’s second chaotic tango at the White House, has been a dramatic, historic and, in many ways, transformative event.

The 47th President is a far different figure from the 46th, though Joe Biden looms large in Trump’s imagination and in his speech; he refers to his predecessor in nearly all his public remarks and at cabinet meetings – and recently installed a wall legend at the White House proclaiming that Biden was the worst president in history.

But what is more important is that the 47th President is a far different figure from the 45th – Trump himself.

The first time around, he was new at the seat of power, new at international conclaves, new in relating to Congress. He did not know Washington, and Washington did not know him. He did not know NATO, and NATO did not know him. He was younger than he is now, and the difference between 71 and 79 is palpable. He moved with more physical ease than the Trump we see now, but with less decisiveness, less confidence.

In his first term, he resisted early urging to act “presidential,” but not with the ardour he does now. This time, Trump has redefined “presidential.” The term “presidential” now is as Trump does. The other day it included a crude expletive and an obscene finger gesture at a heckler in a Detroit factory.

He already has dominated American politics for 11 years, only half the period that William Lyon Mackenzie King was prime minister, but he likely has put more of an indelible stamp on the White House than Mackenzie King did at Laurier House. Sending the bulldozers to flatten the East Wing, demolishing the Rose Garden, and contemplating changes in the West Wing is the least of it.

By the time he completes his second term, in 2029, he will have had the impact on the life of the United States as significant as did Franklin Delano Roosevelt, who transformed the country in multiple, profound ways with the New Deal recovery from the Great Depression and the global affairs immersion of the Second World War.

Under Trump, the U.S. has withdrawn from dozens of international agencies, raised questions about the survivability of international agreements, and undermined the informal byways of the postwar world that built American power even as they ameliorated the harshness of poverty and hunger around the world. Under Trump, centuries-old customs that governed presidential political conduct were abandoned, constitutional brakes on presidential power were decommissioned, and the balance of power that gave the courts and Congress equal power in the American government was disrupted.

And under Trump, the assumptions of national and international life were assailed, including the decades-long assumption that the U.S. and Canada were all but geopolitical siblings: that the American military umbrella covered Canada, that trade relations between the two countries were so robust that they were unassailable and could only be enhanced, that presidents and prime ministers saw the world similarly and saw the other’s country as a fellow traveller, even a genial companion, in world affairs. All that is gone.

Antonio Gramsci’s famous remark that “the old world is dying, and the new world struggles to be born” is often quoted but rarely with real applicability. This time, there is real truth to it.

The six words that follow that quote almost always are omitted: “Now is the time of monsters.” The historians of the future will be hard at work to determine whether this truly is the time of monsters – there are many suspects in that category, across many continents – and to evaluate how Trump will be regarded decades and generations from now.

But this much is unassailably true: One year into his second term, Trump is the most known, the most quoted, the most observed, and the most important figure of our time, as a new world struggles to be born.

The Palm House at Kew Gardens, the most famous tropical greenhouse in the world, is due for a renovation. The collection of plants won’t last long in Britain’s climate – but getting them out of the Victorian sanctuary is the first step in fixing the 177-year-old structure.