Yup. It's fucked but Canada was claiming neutrality as part of the British Empire meanwhile they were letting in Confederates, who were using Toronto as a northern base. The English built boats for the Confederate navy. After the war Jefferson Davis was given a place to live in Toronto where he retired. There are many plantation style properties built along the Canadian border through southern Ontario, many built after the civil war by "refugees".

A lot of Canadians also fought in the civil war, though to be fair it was on both sides, as there were many Canadians who saw a moral need to fight against slavery as well