Interesting discussion. Would have chimed in earlier, but we've had a bit of an earthquake in my city.
Prior to Model T production, most Fords [ N, R, S etc] & other US cars were RHD. Henry went to LHD with the T, probably following state laws coming in then, especially Michigan.
But Ford US was making RHD T's, for export as some of the first T's to New Zealand & Australia were shipped by Peabody's of NY. After a couple of years, Ford Canada became responsible for exports to British Dominion countries which mostly used RHD.
Canada was set up for exporting but not because of RHD. Ford US had a huge home market & the large Sth American market which also was mostly RHD! Canada had a small local market but being part of the British Dominions, could export at a lower tariff cost to fellow 'British' countries. These included Australia, New Zealand, India, Malaya, Sth Africa, Singapore & many small markets in Africa. Ford England supplied the British Isles & Ireland , also parts of Europe. Ford US did most of the rest, either RHD or LHD.
This scenario only lasted up to before the War. The Ford markets became much more complicated after the War era.
