As Canadians absorb U.S. President Donald Trump’s trade war and his threats to make Canada the 51st state, one thing has become abundantly clear: One of the world’s most durable and amicable alliances — born of geography, heritage and centuries of common interests — is broken. Canadians are feeling an undeniable sense of betrayal after Trump declared a trade war against America’s northern neighbor and longtime ally. Trump keeps threatening Canada’s sovereignty and and vowing to put sweeping 25% tariffs on Canadian products, though Canadian Prime Minister Justin Trudeau said Monday afternoon the tariffs will be postponed by at least 30 days after he promised more cooperation on the border.

In Canada, discussion and disapproval are everywhere. Canadian hockey fans have even been booing the American national anthem at recent National Hockey League games. Addressing the nation this past weekend, Trudeau channeled the betrayal that many Canadians are feeling, reminding Americans that Canadian troops fought alongside them in Afghanistan and helped respond to myriad crises from wildfires in California to Hurricane Katrina. The ties between the two countries are without parallel. Nearly $3.6 billion Canadian worth of goods and services cross the border each day. “It’s certainly one of the worst moments in Canada-U.S. relations since the creation of Canada in 1867,” Daniel Beland at McGill University said. “His talk about making Canada the 51st state is a direct attack against the country’s sovereignty. Even if we exclude that threat, he shows no respect for Canada’s sovereignty and institutions.”