The United Kingdom; The European Union; NATO: which is the primary sense of identity?

[Brenus]

If you want to go there, I will give you a history lesson, boyo.
Then Napoleon came to power, who was left-handed.
As for the USA, the standard of the right was present in the old french colony of Louisiana and they were in defiance of the British, who used the left-side. So they used the French to make a statement. Canada later converted due to cheaper cars from USA (economics).
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Interesting theory.
Bit of contradiction as Napoleon sold the Louisiana to US so how Louisiana could have imposed the Napoleonic standard?
The 2nd problem is in no official painting Napoleon is shown as left handed, as far as I know...
It seems that the right was indeed used in France. The reason I found, without any certainty, is the use of the 6 horses coach, with 1 postilion riding the head left horse.