When did the USA introduce metric system as preferred for weights and measures?

never
1805
1866
1975
Pres­i­dent Gerald Ford signed the Metric Con­ver­sion Act in1975. It declared the metric system "the pre­ferred system of weights and measures for United States trade and com­merce", but per­mit­ted the use of United States cus­tom­ary units in all ac­tiv­i­ties. The met­ri­fi­ca­tion board was abol­ished in 1982 by Pres­i­dent Ronald Reagan.

Answers distribution

never
1805
1866
1975
answers
flagPoland
63%
3%
14%
18%
232
flagUnknown
69%
7%
15%
7%
26

Gender

men14%
women23%
never
64%
50%
1805
4%
11%
1866
16%
14%
1975
14%
23%

Language versions

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When did the USA introduce metric system as preferred for weights and measures?
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