The federal government is indeed making some progress in the legal requirements being 'fair' for everyone. The problem is with our basic system, designed into the Constitution, of 'states rights'. This makes legislators & *sigh* judges in some states feel that they can resist these commie, pinko, liberal attempts to interfere in their 'hallowed traditional way of life'.
Getting the system adjusted and ruled on by the courts... and new laws enacted by Congress ...is a painfully slow process in these days of Tea Party BS and right-wing judges.

But... the good news is that new states are falling into line constantly. Kansas is just an unusually hard nut to crack. (I wonder if they study Alabama & S. Carolina & Texas before they start another batch of silliness?)