The Chinese government has begun a concerted campaign of economic threats against the United States, hinting that it may liquidate its vast holding of US treasuries if Washington imposes trade sanctions to force a yuan revaluation.
There's a fair number of caveats to go along
with this story. The major one being that China and the US are in a sort of symbiotic relationship where the Chinese can't afford to devalue the dollar too much and cause inflation is the US because that would in turn hurt their ability to sell goods to American consumers.
Of course, the same logic holds true with upping the value of the yuan, except that it won't be just American consumers that will find Chinese goods more expensive, and while China and the US do have a great deal of trade between them, China still has more trade with neighbours like Japan and South Korea. So for China, losing a share of the American market has to seem like a better option than losing market share everywhere.
More to the point, the US dollar has already dropped a great deal in the last few years without any let-up in the American trade deficit with China, and the dollar's continued weakness means that China dollar reserves keep losing value the longer they hold them. Diversifying makes sense, even if it has a negative effect on your consumer base, because like it or not, the US is due for a correction of its market regardless what the Chinese do. If you spend more than you earn, and the US has been doing so for years now, at some point the bills come due and spending has to be tightened. Or you go bankrupt. either way, your credit isn't going to be that good.
And the Chinese have one other ace up their sleeve; regardless how bad the US dollar gets, they are still going to need to buy plenty of manufactured goods, and
all of the factories are still in China. That's the reason the weakness in the US dollar hasn't affected the trade imbalance, and why it will take a long time for even a collapse in the dollar's value to change it. Money valuation can change rapidly, factories don't move nearly as fast.