The only possible way would be to have Congress pass a law mandating that the switch-over be made. However - in the US this is highly unlikely to occur since any such mandate would be wildly unpopular and might cause repercussions against those who voted for it (much as is currently about to happen with the ill-conceived CFL light bulb mandate).
It will probably eventually come about anyway since many-many products are manufactured and in common usage, all equipped with metric fasteners and other metric-based specifications. Eventually the educational system will adapt to teaching the metric system alongside the standard English-derived system, and eventually will cease teaching the standard measurement system altogether.
To comply with the internationally accepted SI units.
Because almost all countries in the world are using it and the fact that it is so simple that even they could use it.
1957.
METRIC
It's metric and imperial.
The US does not use the metric system.
We could. but we'd need the president to "okay" it. we just like to be different.
metric system is for commies
1.1 US ton per metric ton.
The US has not converted to the Metric System yet. We are still using the English Customary.
900,000 metric tons = 992,080.18 US tons.
45 US tons is 40.82 metric tons.