Although there have been many attempts to get the U. S. to adopt the Metric System, it generally hasn't been very successful. I think one of the factors in this are the base 10 basis of the Metric System (which is only evenly divisible by 2 and 5), while U. S. Customer Measures are divisible by more factors. As an example, the foot can be evenly divided into 2, 3, 4, 6 units.
Maybe it would be better to simply the U. S. Customary System. For example, rather than having ounces for both weight and liquid measure, replace the liquid ounce with the gill (an existing but little used measure that is equal to 2 fluid ounces). Then U.S. liquid measures would work like this: 4 gills = 1 cup, 4 cups = 1 quart, 4 quarts = 1 gallon.
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