In the map, areas shaded green show where the metric system is used where as the areas in grey use the imperial system. The metric system was, in the words of the French philosopher Condorcet to be “for all people for all time”. It was designed for ordinary people, for engineers who worked in human-related measurements and for astronomers and physicists who worked with numbers both small and large, hence the huge range of prefixes that have now been defined.
The United States is the only industrialized country to still use the imperial system, however the metric system does still see use there.
Should the United States convert to the metric system, what do you think?