The large trade deficit. Since the US has so many imports, it has relative stability as compared to other countries. Other countries have to deal with their local currency while having to buy and sell internationally in USD. This means currency movements really come into play.
Plus, the USD is spread over the globe (and more areas) than even the Euro, which is essentially regional.
The size, depth, sophistication, and liquidity of the USD give it a lot more stability than other currencies.
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