The meter was made up based on falsified survey data because they assumed the earth was a perfect sphere and when the math didn't add up, they fudged it.
All measurements are arbitrary unless we come up with some universally constant distance based on something like a wavelength through space.
Some systems of measurement are far easier to use daily to complete tasks and some systems of measurement are devised by academics or revolutionaries with the simple goal of replacing what came before.
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