President Donald Trump said the US will put a 35% tariff on some imports from Canada, escalating the tensions between two countries that have impaired one of the world’s largest trading relationships.

The imbalance in President Trump’s treatment of America’s closest trading partners may come from his desire to make Canada the 51st state, some Canadians believe.

The trade war between the US and Canada has escalated sharply with President Donald Trump increasing the tariff rate on Canadian imports from 25% to 35%. Most goods will avoid the increased costs entering the US market because they are protected by a trade treaty.