The fur trade opened up the interior of the United States.???Trapping had a dramatic effect on the settlement of the United States,??? Sievering said. ???Cities such as St. Louis, Cincinnati and Detroit all have their roots in trapping.???IF YOU GODirections: To get to the Alabama Trappers and Predator Control Association Fall Rendezvous, take Interstate 20/59 south from Tuscaloosa to Exit 62.