As a start and a reference to a source, you might like "Why does North America drive on the right side of the road vs the British way of left?" at https://www.reddit.com/r/AskHistorians/comments/1com7k/why_does_north_america_drive_on_the_right_side_of/ , with an answer by /u/MrDowntown .

This is just a starting point, not to discourage more discussion. Further questions, info, and debate are welcome.