The US wields incredible negotiating power and hegemony because the dollar is the world’s reserve currency. Like the British pound and the Dutch guilder before it, if that loses reserve currency status it will be harder to borrow on favorable terms, which would affect the entire US economy. This is a big step in that perhaps starting to happen over the next few decades.
I think this has the causality reversed. The dollar is the world's reserve currency because the US wields incredible negotiating power and has been the de facto military hegemony in the past few decades. It seems likely that the dominance the US has enjoyed in the recent past will diminish somewhat as other blocks with larger population bases catch up on the technology and industrialization fronts, and eventually sta…
Originally, yes. The US dollar did become a reserve currency because because of the circumstantially huge negotiating power of the USofA, however, as it stands now, the negotiating power is dependent on the dollar being reserve currency. The US is running on a consistent trade deficit, which is supported by the dollars covering economic growth outside of US.
When self-supporting systems are thrown off-balance, the sign in the feedback loop tends to reverse.