You make a lot of good and important points, and clearly things are out of whack when our national wealth increases massively while the majority of our population does more poorly than they used to, on an inflation-adjusted bases.

One comment, however, on your statement about the US slice of the world pie shrinking. When we look at the share of the global pie, and don't also look at the absolute numbers, we can get a distorted sense of loss.

If the world's pie grew by, say, 200% (not saying this is the real number, since I don't have the actual number - this is intended as an example only) and our share went from 50% to 25%, our slice's absolute value *grew* by 50% (from 50% of the original pie to 25% of a 3-fold larger pie, or 75% of the original pie).