American workers' wages stagnant, even in a great economy: why?

[Javaman]

Overwhelmingly they are rich because their family is rich.
When you have enough money, money makes lots of money by interest alone.
And if you have say a person in charge who is also rich who can sway the economy in your direction.....

That reminds of something was once said by a Canadian 1%-er. I'm paraphrasing, but he said something along the lines of:

Turning $100 into $110 is a lot of hard work. Turning $100,000,000 into $110,000,000 is inevitable.

Ironically (or maybe not) the one place in the developed world a talented, hardworkng individual is least likely to realize the American Dream is in the USA. At least, that's what the stats show.