Watch Traces of the Trade: A Story from the Deep North (2008) : Full Movie Online Free A descendant of the largest slave-trading family in U.S. history, filmmaker Katrina Browne explores the contemporary legacy of slavery by traveling with fellow descendents from Rhode Island to Ghana and Cuba, retracing the Triangle Trade route. Along the way, Browne and her companions meet with similarly interested travelers and discover the considerable importance slavery once had for Northern commerce.