50Hz pretty much everywhere.
Many countries had their initial power infrastructures and standards from a colonial past. So you tend to find power standards match the country that was their colonial ancestor if there was one 100 years ago.
Subsequent standardisation would be to conform for trade reasons. So here in the UK we used to be at 240V, but standardised at 220V to come into line with where we buy our appliances - the European Union.
Canada will have had a British past, but buys most appliances via the US so conforms to USA standards. Bizarrely this leads to them using ovens in Fahrenheit even though they use Celsius to measure temperatures generally
My father worked in the power industry. I'm a power generation bore
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