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:
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*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 ( • The Best Banknote in t... )
“Dollar Bill and Australians Keep The Wheels Of Industry Turning” by NFSA Films ( • Dollar Bill and Austra... )
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