 Complete the following phrase:  The refugee slaves who settled in Canada did so primarily in South Western Ontario, with significant concentrations being found in Amherstburg, Colchester, Chatham, Windsor, and Sandwich. Run-away slaves tended to concentrate, partly to provide mutual support, partly because of prejudices, and partly out of the fear of American bounty hunters crossing the border. The run-away slaves usually arrived destitute and without any assets, had to work as laborers for others until they could save up enough money to buy their own farms. These settlements acted as centres of abolitionist thought, with Chatham being the location of abolitionist John Browns constitutional convention which preceded the later raid on 