Pacific Ocean . By the end of the 1800s , vast numbers of immigrants all but erased the unsettled frontier , and changed the lives of every American in one way or another permanently , especially Native Americans . Telegraph wires , railroad tracks , and other trappings of civilization came to dot the landscape , much as herds of buffalo and vast expanses of empty land did in days gone by (White , 1983 . The Oregon Trail , logistically , seems to have been defined by the terrain over which...











SUBJECTS

