Pedantic comment: USA doesn’t use the imperial system, that was Britain. USA has used the “United States Customary Units” since 1832. Since 1893 the units have been defined in terms of metric.

Since 1991 the rule has been to “prefer metric units”, which I guess is why all packaging you commonly see includes measurements in both systems.

https://en.wikipedia.org/wiki/United_States_customary_units

edit: After living in EU and US, I will grant that the lbs is a more convenient unit for measuring food. A kilo of apples is a lot, but a pound is just right.