Why Do Some Countries Drive On The Left?

It is a simple question, but one that we probably give little thought to, until we're in another country, on the wrong side of the road! But it is strange to learn that two thirds of the world's inhabitants drive on the right side of the road, while the rest drive on the left. Quite puzzling when you think about it. But luckily for us, the folks at MinuteEarth, are bent on answering all of life's questions- each with a short two and a half minute explanation. Today, their query focuses on this very question, and they do a spectacular job answering it: RELATED: Female Engineer Invents Robot Traffic Cops [w/ video]
From Royal decrees, to laws in spite of former rulers, to just the practicality of whipping a horse properly (a practice that we do not condone), the reasons for why a country drives on a particular side of the road are numerous and varied. Just make sure you know what side of the road to drive on when you leave the house today! RELATED: 1973 Mercedes-Benz Experimental Safety Vehicle ESF 22