Comment by mulmen
3 years ago
I'm not convinced re: cross-border sales. When Canada was on the imperial system they were on the actual Imperial system. The one the British adopted in 1826. That's post-revolution so the US was on the US customary system which evolved alongside the Metric system and for similar reasons. This means that gallons were different sizes. Today Canada sells milk in bags, I'm not sure that's even available in the US. Cars in Canada have different gauge clusters to support primary-kph. There are probably additional differences in packaging. Does Canada use the same nutrition facts label?
I would believe that there's some standardization from NAFTA and similar agreements with our northern (and southern) neighbors. But I think Canada's usage of the Metric (and Imperial) systems has more to do with being part of the commonwealth and less to do with the US being nearby.
I googled, and this was the answer, there is a separate similar requirement for metric labeling for cosmetics and the like.
https://www.packaginglaw.com/ask-an-attorney/are-both-imperi...
"Labels on packaged food regulated by the Food and Drug Administration (FDA) must provide the statement of quantity in both metric terms (grams, kilograms, milliliters, liters) and U.S. Customary System terms (ounces, pounds, fluid ounces). For meat, poultry, and poultry products, which are regulated by the United States Department of Agriculture (USDA), the statement of quantity need only be expressed in U.S. Customary System terms. The use of metric measurement is voluntary because the Fair Packaging and Labeling Act (FPLA), which regulates labeling of consumer commodities, exempts meat and poultry products from metric statement requirements. (See 15 USC 1459(a)(1)."