Why Some Former British Colonies Use Dollars

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In the UK, they use the pound. So why do some of their former colonies, from Canada to Australia to Hong Kong, use dollars instead?

MUSIC:
"The Wild West" by Ross Bugden
"Working It" by Jingle Punks

SOURCES:
https://en.wikipedia.org/wiki/Pound_sterling#History
https://en.wikipedia.org/wiki/History_of_the_United_States_dollar
https://en.wikipedia.org/wiki/Early_American_currency
https://en.wikipedia.org/wiki/History_of_the_Canadian_dollar
https://en.wikipedia.org/wiki/Australian_dollar
https://en.wikipedia.org/wiki/New_Zealand_dollar
https://en.wikipedia.org/wiki/Straits_dollar
https://en.wikipedia.org/wiki/Singapore_dollar
https://en.wikipedia.org/wiki/Hong_Kong_dollar
https://en.wikipedia.org/wiki/Dollar
*Just because I have sources doesn't mean my research in infallible. Though I aim for as much accuracy as I can manage, there are likely some facts I have gotten wrong.

VIDEOS TO WATCH:
“The Best Banknote in the World!” by BrainCraft (https://www.youtube.com/watch?v=MQEg0e2dfdc)
“Dollar Bill and Australians Keep The Wheels Of Industry Turning” by NFSA Films (https://www.youtube.com/watch?v=5ZTeWLA1LAs)

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