We used to buy cattle from Wyoming.  They would sometimes get shipping fever.  

I read an article that said much of the loss of bee's comes from the way they are handled.  They are shipped from orchard to orchard.  The disruption of their normal home on a weekly or monthly basis confuses them.  Kind of like putting one in a jar and shaking it, I guess.

You might find this article interesting http://nymag.com/daily/intelligencer/2015/06/bees-are-literally-worrying-themselves-to-death.html 

Oh, and the native Americans survived without bee's so humanity wouldn't die out without them, AND they are not native to America. 

"Honeybees are not even native to North America. They were brought here to work, then bred to work more; first to make honey, then, beginning about 50 years ago, to pollinate our crops. They live, almost exclusively, in what are called managed colonies, in hives we’ve built for them so that we might transport them around the country to industrial farms that need them for pollination. Really, they are livestock. "