I hesitate to post this, since I seem to be a proverbial dark cloud of late; however, global investors may be interested in reading this:

http://www.nakedcapitalism.com/search/label/Globalization

Even in a diversified, globalized investment approach, there is opportunity to fail. And, yes, as Erryl mentioned in another post, the reemergence of the US as an industrial nation is not outside of reasonable speculation.