At loggerheads: how a Canada-US trade war could give us all splinters
It's all in the grip when it comes to handshakes, and trade spats - This content is subject to copyright.
It's all in the grip when it comes to handshakes, and trade spats - This content is subject to copyright.

Canadian Prime Minister Justin Trudeau has cranked up his trade spat with the US - a dispute that could have significant ramifications for the UK.

Speaking on Wednesday, he said he would ban the Canadian armed forces from buying aircraft from the US aviation giant Boeing, if President Donald Trump goes ahead with plans for an eye-watering 300pc tariff on Bombardier aircraft. 

The current trade battle broke out last month when the US Department of Commerce ruled that products from Canada-based Bombardier could be subject to sky-high tariffs in response to a complaint from Boeing.

The US manufacturer had argued that Bombardier's smaller C Series jet had benefitted from unfair state subsidies from Quebec and the UK Government. More than 4,000 jobs hang in the balance in Northern Ireland, where the wings for the C Series are made.

Yet tensions have long existed between Canada and the US, despite sharing a trade agreement between themselves and Mexico for the past 23 years.

Well before the North American Free Trade Agreement (Nafta) was brokered in 1994, the US complained that Canadian lumber was unfairly subsidised and so sought to impose tariffs of varying levels.

Successive US administrations have also argued that Canadian milk producers have lobbied to hit US dairy farmers with tariffs of up to 292pc on their products.

Nafta was intended to offer frictionless trade by scrapping tariffs on products, particularly from the agricultural and automotive industries. By 2015, it was estimated to cover more than $1 trillion of trade.

During his campaign for the White House President Trump described the deal as a "disaster" and promised to renegotiate. In April of this year, he started doing just that; in the same month he slapped a 24pc tariff on Canadian softwood imports 

The 'worst trade deal ever'?

If the battle of the planemakers is the hot war, then milk and lumber is the cold one. Lumber in Canada mostly comes from government-owned forests and is milled by private companies, while in the US it comes from largely privately owned land.

There are suggestions on the US side that the Canadian government does not charge a true market rate to those gathering the lumber, in effect subsidising the wood. Part of what is driving the renegotiation of Nafta and the mounting tensions in other areas of trade is that one of the Trump administration's great obsessions is to reduce the US trade deficit overall, particularly with Mexico, in order to put "America First".