Globalization, the boogeyperson of lots of people, has allowed some income redistribution to the developing world -has the developed world not globalized, it's not a given that had the developed world hoarded their industry and jobs the poor countries would have done as relatively well as they have.
It's also surprising to not see much comment on the interesting phenomenon where countries which had relatively good economies in the early 20th century (Mexico, Argentina, etc) went way down hill after WWii, partly severe corruption and simple non-investment due to antiquated policies and emphasis on natural resources rather than technologies.