Opinion: A haven for escaped slaves — and Confederate operatives

Canadians like to recall how British North America was the northern terminus of the Underground Railroad, which sent thousands of fugitive slaves to Canada seeking safety. Between 30,000 and 50,000 slaves are estimated to have crossed the border, primarily into southern Ontario (then Upper Canada). They were supported by an active abolitionist movement, again based largely in Upper Canada. It was a notable moral and policy achievement, and has become part and parcel of Canadian lore.
Less k