Patriotic sentiment is bursting in Canada after President Trump’s threat to apply hefty tariffs and even annex the country. The damage to the two nations’ relationship could be lasting.

Trump has long proposed raising tariffs—or taxes on imported goods that the businesses importing them pay the U.S. government—before the election, and said in November he’ll impose a 25% tariff rate on all imports from Mexico and Canada on the first day of his presidency and will impose an additional 10% tariff rate on all imports from China on top of other tariffs.