They partially did since 1975[1]. [1] : https://en.wikipedia.org/wiki/Metrication_in_the_United_States#20th_century https://en.wikipedia.org/wiki/Metrication_i

They partially did since 1975[1]. [1] : https://en.wikipedia.org/wiki/Metrication_in_the_United_States#20th_century https://en.wikipedia.org/wiki/Metrication_in_the_United_Stat...