Why some countries drive on the left while others on the right?

Today, we have a little history lesson.
We will see why some countries drive on the left, while the majority drive on the right.
And if it was us that were wrong...
Why don't we all drive left?
But what is for sure, it's that you will understand a lot better after watching this video.
So enjoy watching!
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Références :
en.wikipedia.o...
en.wikipedia.o...
Carte des routes romaines : commons.wikime...