A Brief History of Measurement Systems
"Weights and measures were among the earliest tools invented by man. Primitive societies needed rudimentary measures for many tasks: constructing dwellings of an appropriate size and shape, fashioning clothing and bartering food or raw materials."
The Metric System in the United States
"Article I, Section 8 of the U. S. Constitution gives Congress the power to "fix the standard of weights and measures" for the nation. The First Congress, meeting in 1789, took up the question of weights and measures, and had the metric system been available at that time it might have been adopted. What actually happened is that Thomas Jefferson, who was then serving as the first Secretary of State, submitted a report proposing a decimal-based system with a mixture of familiar and unfamiliar names for the units."
How the Metric System Works
"Before there were global supply chains and trade agreements, convenience was the highest priority when it came to measurement. In most cases, people didn't have access to sophisticated measuring devices, so they relied on body parts, which were easy to carry around and offered somewhat consistent results."