Of all countries in the world that has an officially established system of measurement, only Burma/Myanmar, Liberia and the United States do not use the International System of Units (SI). The United States use Imperial units and U.S customary units. That is not to say that SI is not in use in the U.S. The customary units are nowadays defined from SI units. And the National Institute of Standards and Technology uses it. To answer your question: the metrication of the United States is gradual and there is no fixed date where you can say that the US adopted SI. http://en.wikipedia.org/wiki/Metrication_in_the_United_States
1975
The US does not use the metric system.
There isn't a separate US metric system, the metric system is international and the same everywhere. So one kilometre in the U.S.A. is one kilometre.
No
It is a must to go metric. US is the last country in the world that has to go this way. Scroll down to related links and read "THE UNITED STATES AND THE METRIC SYSTEM".
1975
The metric system.
It is to provide a simple and coherent system of measurement units which are agreed by all people. Unfortunately, the US, Burma and Liberia have failed to adopt it.
The US does not use the metric system.
metric system is for commies
There isn't a separate US metric system, the metric system is international and the same everywhere. So one kilometre in the U.S.A. is one kilometre.
The Metric System.
No
No
When we colonized.
The US has not converted to the Metric System yet. We are still using the English Customary.
Only the US uses the metric system. Hope it helped :D