It would be awesome to have a base-12 number system paired with a base-12 measurement system. It's just so much nicer to deal with than metric or imperial. So many measurements would become much easier. Take length. You could have the base measurement be equal to a meter, then use 1/3 meter sticks as roughly equivalent to a 1 foot ruler.
And yet they still use king George's foot as a unit of measurement, curious.
And then became a bloodsoaked colonial power to surpass the previous bloodsoaked colonial power. 
A foot is defined as 0,3048 meter. They use the metric system, but with a conversion.
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It would be awesome to have a base-12 number system paired with a base-12 measurement system. It's just so much nicer to deal with than metric or imperial. So many measurements would become much easier. Take length. You could have the base measurement be equal to a meter, then use 1/3 meter sticks as roughly equivalent to a 1 foot ruler.