China and Brazil recently signed a trade deal in their own currencies, signaling a shift away from the US dollar as the world's reserve currency. This follows a statement by a Russian official that the BRICS countries are working on creating a new currency, and many other countries are interested in joining the BRICS block. The US government's borrowing and spending habits rely on the demand for the dollar, so a decrease in demand could lead to the dollar losing value and potentially falling apart.