Thanks, I heard of it yet couldn’t find the definition :

Since 1893, the legal definition of the foot in the United States has been based on the meter. The definition adopted at that time was the one specified by Congress in 1866, as 1 foot = 1200/3937 meter exactly (or 1 foot = 0.304 800 6 meter approximately).

And now USA will use :
1 foot = 0.3048m
…much more convenient 😆 !