What the F#@%^%$#@K 
Its very much the truth. here in CA during the gold rush many laws were passed banning "chinese" weapons. a "throwing star" is a felony so are numb chucks and have been since the gold rush. In the south many laws have been passed to prevent blacks from getting guns.
When it comes to DL, states do not have to honor all forms of them and can impose greater restrictions on CDLs then teh federal laws. It is also fedreal law, that marrages do not have to be honored by other states if they do not meet the federal tax standard. So example, single sex and common law marrages, do not have to reconized. Some states choose to, but there is federal la saying they don't have too.