How did the discovery of pockets of oil in louisiana and the gulf of mexico affect migration patterns? a) many groups that had lived along the coast moved inland to escape potential oil spills. b) there was a large influx of migrants from pennsylvania, where oil was first discovered in the united states. c)urban populations in louisiana declined as workers flocked to rural areas and jobs in the oil industry. d)many cajuns left traditional pursuits, like farming, for new jobs in the oil fields.