You did not have imperial measuring devices in your American school. They used US Customary Units, which are NOT the same as imperial units.
en.wikipedia.org/wiki/C…
https://en.wikipedia.org/wiki/Comparison_of_the_imperial_and_US_customary_measurement_systems
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You did not have imperial measuring devices in your American school. They used US Customary Units, which are NOT the same as imperial units.
https://en.wikipedia.org/wiki/Comparison_of_the_imperial_and_US_customary_measurement_systems