Canadian prime ministers put out Thanksgiving videos every year, and they are usually about gratitude and harvests. This year Mark Carney’s had a referendum in it. In a video message released on Monday, as Al Jazeera reported, Carney called for national unity a week before Alberta, the country’s oil province, votes on a proposal to secede, and warned that Canada faces threats to its economy, its security and its way of life. His line: “We can’t build big things on fault lines.”

The setting was chosen with care. According to the National Post’s account, Carney recorded it in a classroom at St. Francis Xavier High School in Edmonton, his old school. He was born in Fort Smith, in the Northwest Territories, but grew up in Alberta. He said he is “back home a lot these days” because his government is building “big things” in the province. He described the decision facing voters as whether to stay or begin “a long and uncertain process through which Alberta could separate from Canada.” And he closed with: “Generations of Albertans helped build this country. It’s yours, it’s ours and it’s worth fighting for.”

The phrase “long and uncertain process” is doing a lot of work there, and it is fair, because the ballot question itself is about a process rather than an outcome. On October 19, Albertans vote on ten referendum questions covering immigration, provincial programs, voting rules and constitutional reform. The tenth is the big one. It asks whether Alberta should remain a province of Canada, “or should the Government of Alberta commence the legal process required under the Canadian Constitution to hold a binding provincial referendum on whether or not Alberta should separate from Canada?”

So it is a non-binding referendum on whether to hold a binding referendum. In finance terms, the separatist option is an option on an option. Premier Danielle Smith announced the original nine questions in February and added the remain-or-separate question in May, arguing that an A-or-B format respected both the separatist groups and the pro-Canada campaigns; people on both sides criticised it. Even the eventual “binding” vote would not, on its own, take Alberta out of Canada. A provincial referendum cannot do that by itself under the Constitution, and a vote to start the process would trigger an assessment by Ottawa under the federal Clarity Act before any second referendum went ahead. Winning this round gets the separatists the right to more rounds.

Carney’s argument is, I think, best read as an argument about capital. He tied unity to specific projects, chiefly a new pipeline to the West Coast. On October 1, at an event in Fort McMurray with Smith in attendance, he declared the Pacific Link pipeline a project of national interest, and its regulatory process is being fast-tracked. In other coverage of the video, his line came out as “We can’t achieve any of this if we’re divided. You can’t build big things on fault lines.”

Here is the mechanism, with a hypothetical clearly labelled as one. Imagine you are being asked to lend money for a pipeline that will run for decades and cross a provincial border. Your model covers oil prices, construction costs and regulatory delay. Now someone adds a line for “the province at one end might start a constitutional process to become a different country, with an unknown currency, unknown regulators and unknown treaty obligations.” You do not need to think that is likely. You just need to price it, and pricing uncertainty means charging more or lending less. A prime minister telling voters that secession is bad for big projects is telling them that a lot of people with spreadsheets will be asking that question.

The awkward part is the grievance itself. According to Al Jazeera, the separatist push grows out of long-running complaints about federal energy and environmental policy, with activists accusing Ottawa of unfairly targeting the oil and gas industry that anchors Alberta’s economy. Carney’s answer is essentially: we are now building you the pipeline. That is a decent argument for staying, and it also concedes that the federal government responds to pressure, which separatists could take as a reason to keep applying it.

The numbers

The polling looks good for Carney’s side. In Leger’s latest survey, as the National Post reported, 70% of Albertans favour remaining in Canada, up five points from 65% in August. If that holds, roughly three in ten would be voting to open the door. More than 300 advance polls were due to open across the province on Tuesday, and voting day itself runs from 9 a.m. to 8 p.m.

Carney is spending the week in Alberta and is scheduled to appear on Friday at a rally at the Edmonton Expo Centre held by the pro-Canada group Forever Canadian. Conservative Leader Pierre Poilievre, who is in Detroit on Tuesday promoting a tariff-free auto pact, is due to speak in Calgary on Friday and is also urging Albertans to stay. So both major federal parties are making the same pitch in the same province on the same day, which in Canadian politics is about as close to a consensus as it gets.

There has also been some unrequested outside advice. Elon Musk posted that “Alberta and Saskatchewan should separate too,” and both premiers turned him down. Smith’s response: “I think this is for Albertans to decide.” Meanwhile, separatism is also on the ballot in a different form in Quebec, so the prime minister’s “fault lines” metaphor may get some use beyond Alberta.

So the federal government’s best case for staying together comes down to a pipeline, which is the thing Alberta’s separatists spent years saying Ottawa would never build. It got declared in the national interest on October 1, two and a half weeks before the vote.