I'm personally not vegan and I'm sure as hell not republican but from an economical stand point it makes no sense to outlaw meat, and from a logical standpoint free animals means more breeding and WAY less room than we have now. Finally to address your point on intelligence, I believe that intelligent people become vegan due to a grater sense of self awareness in which translates to more empathetical thoughts. so in conclusion no, becoming vegan will not make people smarter and the economical effects of banning meat in America would be so negative it would outweigh the very little benefits.