To give credit where it's due, most of the stuff I've seen has metric volumes or weights as well. Funny about that soda though. I wonder what they were thinking?
Strange place, America. Decimal coinage decades years before the UK, but they're still bogged down with gallons quarts and pints, pounds and ounces. It just makes it harder to compare prices.
Hang on, ChatGPT says it's not confined to soda but extends to most if not all stuff:
"Actually, the requirement for metric labeling extends beyond just soda. The FDA regulations mandate metric labeling for various food and beverage products sold in the United States, not just soda. This includes items such as milk, bottled water, canned goods, and many other packaged foods.
The rationale behind this requirement is to provide consistency and clarity for consumers by using a standardized measurement system. By using metric units, it allows consumers to easily compare products and understand the quantity they are purchasing, regardless of brand or origin."
It also says it's regulated at the federal level and that individual states can't disobey that. Could it be that the soda was imported from a metric country and so only has metric on the label?