I think it’s implied. There’s a transition to “meanwhile, in the Americas” to explain local customs of driving on the right and why. For me, the missing piece is about how people on the European continent switched to driving on the right. The Romans drove on the left. The Pope wanted people to drive on the left. So, I have to assume that Europeans drove on the left. The argument as to why the British kept the tradition of driving on the left is that it’s an island. OK, so, there’s the Atlantic Ocean between the Americas and Europe. Why did people start driving on the right in Europe? Europe did not share borders with the US or Canada. I guess the author isn’t interested in that because it’s all about the British driving on the left. Which for me is fine. I’ve always wondered why. Mostly, because of the Romans.
I think it’s implied. There’s a transition to “meanwhile, in the Americas” to explain local customs of driving on the right and why. For me, the missing piece is about how people on the European continent switched to driving on the right. The Romans drove on the left. The Pope wanted people to drive on the left. So, I have to assume that Europeans drove on the left. The argument as to why the British kept the tradition of driving on the left is that it’s an island. OK, so, there’s the Atlantic Ocean between the Americas and Europe. Why did people start driving on the right in Europe? Europe did not share borders with the US or Canada. I guess the author isn’t interested in that because it’s all about the British driving on the left. Which for me is fine. I’ve always wondered why. Mostly, because of the Romans.
The French Revolution and Napoleon, looks like!
https://nationalmotormuseum.org.uk/ufaqs/why-do-we-drive-on-the-left-side-of-the-road-in-the-uk-but-most-other-countries-drive-on-the-right/