as far as I know, they are the only country that still uses the standard system. it would make it easier for trading, measuring etc., for the U.S. to change but it isn't cheap to do so.
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Congress adopted an act officially converting the US to metric, and requiring retooling of industry, by a certain date. Everyone ignored it. Congress quietly repealed the act afterwards. We were metric by federal ukase for a short time. No longer.
All the school systems I've known have used metric units in high school science classes. And everyone I know (child and adult) is pretty comfortable using metric units even if their default mode is US standard units.
Americans don't much care what the rest of the world thinks of them so feel little need to show it anything. Should the US government ever get off the backs of Americans long enough for manufacturing to revive, it will adjust as needed.
Hilarious! I love math, but I hate all those "standard" conversion routines. Metric is simple. It's a vast improvement, like Hindu-Arabic numerals were over Roman numerals.