> It's also why people living in the only nation that really has a choice all measure distance and height in (square) feet, inches, and kilometers (per hour), human weight in pounds (and very rarely ounces), most other weight in grams and kilograms, non-cooking-related volume in liters, and non-cooking-related temperature in celsius.
If you're talking about Canada, none of that mess comes from a plethora of choice, it's just the result of American cultural and economic influence, in addition to history. Yes Canadians are well versed in both systems but it's not like we particularly like having to deal with US units in our lives.