A Chalenge

I have a friend who is of Mexican ancestry who believes that the only motivation for the Arizona law concerning the checking of immigration status is raaaaacism. I would like some help… Since the House and Senate have been controlled by Democrats for most of my 60 years I think that a safe bet would be that the Federal Law concerning the checking of immigration status under which it is legal to racially profile when doing stops, compared to the Arizona law where it is Illegal, was passed by a Democratic controlled administration. I would like to confront him with facts and references that the Federal Law that allows racial profiling was supported by Democrats. Could I get some help.