Have you read "Accidental Superpower" by Peter Ziehan? That book pretty much confirms what you said above with real data.
The good news is that the U.S. is better positioned than any other nation to ride out the coming storm. Also, this book was written before the Trump presidency and if anything, Trump's policies will further smooth out the impact on Americans.
That book was recommended by LS and I felt much more optimistic for our future after having read it.
Look at his newer book, “The Absent Superpower.” US is in awesome shape, China and Russia in bad shape.