What contemporary issues create conflict between states, and how might the current administration address those issues through national policy?

Historically speaking, the issues that cause the most conflict between states have to do with the regulation of commerce between the states--an example today being healthcare, which gets increasingly complicated with things like the Internet, which "even the playing field". The Obama Administration deals with these issues by making it mandatory for people to have the commodity in question--in this case health insurance. 

The dethroned emperor!

Yes, some people used the depression to the max. not everybody had stocks, and those that didn't bought many things inexpensive, so that when prices rose again, they were much more richer than beforehope this