What you're ignoring is the fact that economic growth in the United States is stable, and is equal to or better than the other countries mentioned in this article. The US leads the world in income from manufacturing jobs. Well, that was true until 2011, when China topped us, but China has a slight advantage in terms of its gigantic population. Manufacturing has improved in recent years, as well. There were plenty of jobs lost due to outsourcing, but the money never stopped flowing. You are right, though, that the money from the manufacturing industry started increasingly flowing to rich people, executives, and the Koch Brothers.
Still, other countries - Canada is a good one to mention - has a growing middle class whose median income has exceeded the median income in the United States. Yet Canada's manufacturing industry isn't growing any faster than ours. Their manufacturing jobs have actually been decreasing.
So our manufacturing industry is getting larger, and Canada's is getting smaller. And yet their median income now exceeds ours. I believe your argument has been busted, sir.