What If We Had A Global Currency?

Although collecting foreign currencies is incredibly fun, converting your money every time you travel to a new country can be incredibly annoying, so could we establish a single world currency?
MUSIC:
"Summer" by bensound.com
👕 MERCH!
crowdmade.com/...
📖 SOURCES:
en.wikipedia.o...
money.howstuff...
en.wikipedia.o...
*Just because I have sources doesn't mean my research is infallible. Though I aim for as much accuracy as I can manage, there are likely some facts I have gotten wrong.
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