I have poked around a bit in your collection Oh, you mean the Smorgasblog! Yeah. Actually, I recommend that sort of thing to anyone with the time – it forces to me to become a more active blog-reader.
I think the Scotch-Irish heritage has a lot to do with Americans’ attitudes toward central authority, and our propensity to keep wandering, as you say. And I guess the latter does contribute a lot to the transfer of exotic species and diseases. I’d never thought to connect the two before. Obviously, the current economic emphasis on “free” trade from all corners of the globe is a huge part of the problem, too. A lot of nasties are arriving in packing materials and the ballast water of ships.