I found this map from Business Insider that lays out the most important invention per state... and I have to say.... thank GOODNESS for New Jersey! Their's is air conditioning! I know there's bigger inventions out there, but I do not like to sweat.... at all.
Here's some others for ya!
NY - Credit card (great but horrible at the same time!)
MA - World Wide Web
VT - Paddle Wheel Steamer
WI - Space Suit (awesome!)
NC - Airplane (duh)