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The system of measurement used across the British Empire. Now pretty much abandoned in favour of the metric system as what little is left of the British Empire is absorbed by a European federal state.
The use of the metric system was made legal as a system of measurement in the US in 1866. The system was officially adopted by the federal government in 1975 for use in the military and government agencies, and as preferred system for trade and commerce.
Serial numbers are counters and security features, but don't help to ID a bill and rarely determine its value. What matters are: > The bill's date > Its seal color > Its condition > The letter, if any, next to the date > In some cases, the issuing Federal Reserve District if it's a Federal Reserve Note.
federal agencies
Boats less than 39.4 feet operating on federal control waters must adhere to specific safety requirements, including having a wearable personal flotation device (PFD) for each passenger, a fire extinguisher, and a sound-producing device like a whistle. Additionally, vessels must have navigation lights if operating after dark and comply with any federal regulations regarding equipment and safety. It's also advisable for boaters to take a boating safety course to ensure they are aware of all regulations and best practices.