In May, as part of his campaign to annex Canada, President Donald Trump called the border with his neighbour an artificial line that had been drawn with a ruler “right across the top of the country”. He suggested that the map of North America would look more beautiful without it.
Historians pointed out that the border reflected a complex history and an everyday reality for millions, but they also admitted that Trump wasn’t entirely wrong. Much of the border does follow a straight line – the 49th parallel – and the Americans and Britons who drew it up knew almost nothing about local geography.
