Quote:
Originally Posted by sir_pudding
No they aren't. The "Imperial System" was established in 1824 and the US Customary system wasn't in any way based on on it. The Department of Commerce maintains the Federal weights and measures standards and the individual States have their own copies of these. These standards were created and are maintained without any reference to the ones in London (which are no longer maintained).
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Maybe neither that 1834 Imperial system was not the basis of the US customary system, but they were both based on earlier British units, apparently the Exchequer Standards and the Winchester Units. Without doing the research (a bother on a phone screen), I would guess that each subsequent system was more rigorously defined, and possibly simplified.