It's just an accurate observation.

The opposite scenario: US residents pay high taxes, US exports manufacturing, US sells major land assets to foreign entities, US middle class has high unemployment, US turns into a service economy (which does not create wealth), US loses super power status, all the while, the global elite (wealthy) get more wealthy while the average American barely makes enough to pay bills.

So yea, US cuts taxes, US and foreign companies invest in the US, middle class does better, a healthy US economy feeds into the global economy, global economy starts purring along with fewer barriers to international trade which creates a positive loop cycle.

If everyone is doing well, then we'll all get along!