Nearly a quarter of the world drives on the left. But why? There’s a quite reasonable explanation for that.
The Ancient Romans drove on the left too. So it was more natural for right-handed people to ride horses on the left.
Most people trace the answer back to Napoleon, who decreed that in his empire, everyone would keep to the right.As Nepoleon’s armies conquered more and more of continental Europe, this rule took effect over this same area. Even after his Empire vanished, the right-hand rule stayed on.
From then on, any part of the world which was at some time part of the British Empire was thus left hand and any part colonised by the French was right hand.
In America, the French colonised the southern states (Louisiana, for example) and the Canadian east coast (Quebec). The Dutch colonised New York. The Spanish and Portugese colonised the southern Americas. So The British were a minority in shaping the ‘traffic’. That is why the traffic in the USA is right-handed.

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