Because the Runaway Slave Laws didn't apply in Canada, as you would have known had you done any reading on the subject.
Which begs the question, if the North was this wonderful place so incredibly sympathetic to the plight of runaway slaves, why DIDN’T these kind folks — all of whom were MY ancestors — shelter and protect them HERE in the U.S.?
Could it have been because MANY large, wealthy and influential NORTHERN interests were providing the FINANCING for the SLAVE TRADE??
Gives a new meaning to HYPOCRICY.