I came across this interesting website titled "Trade Benefits America" that maps benefits of trade to states within the country as contrasted to the national level.Normally, trade analysis is limited to the benefits a country gets in terms of national outcomes - jobs, GDP growth, investment and export growth. Going to the sub-national level is normally not attempted. This website maps perceived benefits right upto the State level on many parameters. It makes trade look more relevant and grounded.
I had blogged about this issue some time back here.
Some lessons to be learnt for countries having federal polities.