There have been more than a few articles lately (last 6 months) predicting the demise of their economy, with all of the predictable downstream results (inability to invest in the military infrastructure, especially their expansion into the SCS, etc.). With the way they are spending money like drunken sailors (and I have been one so I would know...), the $$ is going to run out sooner or later, and there would be the typical contraction of military spending and deployments. We'll see.
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China has been manipulating their currency while purchasing monolithic amounts of gold. Several oil rich countries have wanted to shift to a gold backed currency, to later find themselves on the receiving end of an American involved liberation/revolution. Iraq, Libya, Syria to name a few. China has also mentioned a desire to transition to a gold backed currency ad the international reserve.
I'm not going to dive into the tin hatter stuff that's all over the interwebs, but there is plenty to read about, from false markets, to petro dollar, to the just so happens resource rich countries we have had the longest wars known to our history.
That all said, I expect the US economy to collapse completely, followed by the USD being abandoned as the international reserve currency, followed by China releasing a gold back currency to take place as the reserve currency. The US will go through about the same as the USSR did in the early 90's, reemerging 5-10 years later as still a global power, but significantly diminished in global influence.
Or
We are going to have World War Three and do like the Romans did, and use our significant military capabilities, along with our allies, to beat down whoever attempts to jack with the fiat currency system we have. This would look something like North and South Korea go at it as proxi of China and the US, Japan and China bang it out, with our support for Japan, India and China also start banging it out. Russia and the NATO countries bang it out in Europe, obviously with US involvements. We beat down China, fuck Russia up, start a new international trade and commerce arrangement with a new currency that favor's the US and Europe and carry on for another 70 years.
But than again, I may just be crazy...