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because american industrial infrastructure was already largely built up before even europe was industrialized or converted to metric. it is, in fact, a massive hassel for engineers to switch over simply because all instruments and gages and measuring devices and tools and whatnot are already in British units.
is it worth the hassel? not really. its genuinely less hassel to just use both systems (which is already the status quo in the USA among any kind of engineering or scientific practice)
