Right hand to left hand drive change date

[Tudortomnz]

From old photos, it appears that most US auto companies had gone to LHD from about 1910. A few carried on RHD, Pierce Arrow was one, probably to be 'exclusive' from cheaper cars. A couple of Canadian provinces stayed RHD until the '40's. I would be interested to know whether some US States legistated the change to driving on the right side of the road or if the auto companies decided to standardise assembly for LHD.