Dear Congressman ____________,
Good day, I just want you to pass a law that would require vendors to use the metric system instead of a non-standard system or English unit. It is because the advantage of using the metric system is that it will be more understandable by other people, some people do not know the equivalent of many English unit, causing them to get confused on converting it. Unlike in metric system, we just memorize the prefixes used in order to convert length, and other units of measurement.
Sincerely yours,
_____________
