At least according to this cool Google Trends analysis of searches using the word “vegan” 2008 to the present. It was created by Compassion Over Killing, and, yes, it starts on the coasts (especially the PNW and the NE), but watch as it slowly spreads into the heartland.
There are holdout states, of course (I’m looking at you, Wyoming), but if Google searches are destiny then veganism is an idea and way of life whose time is arriving.
The Earthist Chronicles 
Thanks for sharing our graphic! It’s bad-ass that veganism is becoming so mainstream.