Canada decides which side to drive on.

For much of its history half of Canada drove on the opposite side of the road from the other half. Ontario and Quebec drove on the right, while British Columbia and The Maritimes drove on the left. When New Brunswick changed sides of the road the year became wryly known as “The Year of Free Beef.”

https://backyardhistory.ca/articles/f/switching-from-driving-on-the-left-to-driving-on-the-right