Why is the US only country in the world with non-metric system of measurement?

(Except Liberia and Burma). Measurements in the metric system are derived from scientific principles. Even the English are metric who actually invented the imperial measurements based on natural measures in a simple agricultural society. It makes no sense to retain the old system - advantages of metric are... show more (Except Liberia and Burma). Measurements in the metric system are derived from scientific principles. Even the English are metric who actually invented the imperial measurements based on natural measures in a simple agricultural society. It makes no sense to retain the old system - advantages of metric are simplicity, ease of calculation and international standards. Is there any plan to bring US measurements into the modern world?
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