The traditional British units of measurement go back to Anglo-Saxon days. They are classified as units of:
etc. Separate articles will be specific to each of the above.
The United States customary units are, in the main, derived from the traditional British units, as the colonizers brought their familiar units of measurement with them. In 1824, the United Kingdom passed a Weights and Measures Act, defining the British Imperial system of units, also mainly based on the traditional British units.