Earlier quoted context omitted.
> we don't use leagues or furlongs. I know what a chain is because i have one, but that's specifically to measure land against a plat map. Every location in this country is based off common reference locations (there's a literal marker on the ground) The same holds for more obscure unit prefixes in the SI system like dam (decameter) or hm (hectometer) in the SI unit system (as far as I am aware, the only common usage…
I forgot one thing. you said "why not have in^2 and in^3" we do, but we don't use that very often. Older American "muscle cars" engines' displacement was measured in cubic inches. every child learns what a square inch is. a "board foot" is 12 cubic inches of milled wood, 12 in^3 - I don't know how to verify this on a Sunday, so this may be wrong, the board-foot. And then, we use square feet; for floor space in a hous…
Doesn't mean the USA has to switch for common use.