In 1858, 600 blacks moved from San Francisco north to the colonies that would eventually become British Columbia (B.C.), Canada. The move was in part initiated by an invitation penned by the governor of the British colonies, James Douglas, who is commonly believed to have had African ancestry, a rumor he neither confirmed nor denied. His appearance was such that he could "pass" for white. By 1871, after swelling to more than 1,000, the black population...