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Um actually the US doesn't and never has used the Imperial System
We use freedom units, where everything is measured in cheeseburgers.
The US certainly did use it.
Today though, it's known as American Customary Units, which are similar to Imperial, but there are differences.
American customary units and imperial units both come from English units, so the US used various inconsistent English and other units in its early days. But the US never used "Imperial" units, which were not codified and put into effect in the British Empire until almost 50 years after the US had gained independence.
ACKTUALLY...
But yes, it does bother the pedant in me to see everyone calling it "Imperial system" when it technically isn't
Technichally