The US doesn't use imperial, it uses US customary.

There's no US customary Roman mile, ell or skeine, for example.

Chains and links are basically standard surveyors chains. They're distinct units in their own right in the sense that a metric chain or metric link is. Should your metric chart have a metric chain on it? What about light years or parsecs?

Hands are used in measuring horses, and that's basically it. They're used in commonwealth countries, the US and South Africa.