Long time coming, the signs have been there for years. Trump has accelerated the process, though it would be beyond foolish to blame him for it.
Foreign countries have been expanding gold stockpiles. Our allies have been relocating 100’s of tons of gold back to their own countries. Russia set up their own financial SWIFT equivalent, and Europe has openly called for an alternative to SWIFT, which they are looking into. Oil is being traded in Yuan. A dozen or so countries are working out the system to bypass trade in dollars. There is much, much more…
Our countries continued hegemony will rely on control of space - SpaceX.