The downfall of America was finalized the day we abandoned the Moon.
Have the treaties illegalizing the exploitation of the Moon ever been repudiated?
We've had a lot of dark turning points, but I agree, that was one of the biggies.
Who would have ever thought Americans would have to hitch a ride to space with the Russians??
"White man break treaty, again?"

No, the Space Treaty is still in force for the signatories. Further - and why this will never be done by private enterprise located in one of those countries - is that any tech, and finding, and anything at all used in such a venture must be turned in its entirety over to the UN’s governing Space body.
In other words no one, no company can make a profit or use proprietary tech.
The exception is, of course, to have a company headquartered in a non-signatory country, or be a non-signatory country like China ...