When did the USA introduce the 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.
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never
1805
1866
1975
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flagPoland
56%
5%
13%
24%
830
flagGermany
61%
11%
11%
16%
18
flagthe United States
33%
33%
25%
8%
24
flagthe United Kingdom
64%
7%
21%
7%
14