Since 1952, when I first left the U.S. at the age of 6, I have lived many years in Latin America and Asia. I have visited every continent except Antarctica. I have studied every major world language except Arabic. I have traveled on cargo planes, by truck, on foot and even by mule. And everywhere I went, I accumulated a vast photographic record of the hard-working people I met. But for many years, there was one thing I did NOT do in those countries: Invest my money. It's not that I didn't believe in their future. Rather, what stopped me was another, far more critical, consideration: I didn't trust their currencies. Throughout the developing world, basic infrastructure was spotty. Domestic banking was shaky. Federal deficits ...