Of the 35 countries in the Americas, only 1 doesn't use the metric system officially, and even then, this is only "officially"; for many purposes, the metric system is commonplace. United Stated refuses to convert because of pure ego, there is no real reason not to change. In fact if USA were to convert, it would actually help with their trading of products with other nations. Not the smartest of countries, business wise, sad to say.
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Most countries use the metric system exclusively, or almost exclusively. There are three countries in the world that do not use the metric system: Liberia, The United States of America, and Myanmar.
A short ton, known in the United States simply as the "ton", is equal to 2,000 pounds (907.18 kilograms). The SI unit of measurement, the metric ton, or tonne, is 1,000 kilograms(2,204.62 pounds). The metric ton was introduced in 1960 to standardize measurements. Since the introduction of the metric system, the short ton is rarely used outside of the United States.
Roughly 3 million metric tons of explosives were produced in the United States. The coal industry continued to be the largest domestic user, accounting for 67 percent of total explosives consumption.
They should start using ONLY metric units. It is high time that the United States starts using international units.
The "Metric Act of 1866" was significant because it recognized the metric system as a legal system of measurement in the United States. Basically, it said that the metric system was reliable enough to be used in the U.S. The act is sometimes referred to as the Kasson Act, after Congressman John A. Kasson of Iowa, who chaired the House Committee on Coinage, Weights, and Measures.