[smsm42]

That's what happens when you do federalism only when it's convenient. Right now since "interstate commerce" is extended to cover any activity that may be imagined to be related to commerce (including growing plants in your own garned for your own benefit) it means federal government can force commercial entities to do anything. Including complying with foreign laws (including non-existant foreign laws: http://www.threefelonies.com/Youtoo/tabid/86/Default.aspx#La...).

Single federal sales tax with distribution would result in either grotesquely complicated calculation system or some states sponsoring other states for political reasons. And, of course, all local governments blaming federal governments for the lack of funds and their inability to do anything.