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The Imperial unit system also includes the United States' customary units, and is still commonly used in the USA and to some degree in Canada. When you read a Federal law or a safety standard in the USA, it still shows Imperial units. For example, you can access the USA Federal Law to see how Imperial units are still used in the standards provided there.
The Imperial unit system was first defined in the British Weights and Measures Act of 1824. The system then came into official use across the UK.
If you are interested in the history of the Imperial unit system, you can refer to this article.
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