DC,  What evidence do you have for cause and effect for your claim that these laws prevented any blacks from moving to Oregon?  It was expensive and dangerous to travel from the  east to Oregon either overland or by sea.  Prior to the end of the Civil War how could a slave get to Oregon and why would free blacks in the north wish to come to Oregon?  Instead of accusations and insinuations of others you should apply some academic rigor to your own theories.  For example, how exactly did virtually illiterate, dirt poor, and oppressed blacks in the south hear or read about George Bush being expelled?  Was this case plastered all over eastern newspapers?  That would at least begin to support a theory that eastern free blacks didn't go to Oregon because of the expulsion.