When and why did the different car designs occur with the British driving on the left side and the US on the right?

by HelloDepression

Other countries included as well. The reason for driving a car on the right and driving a car on the left side always puzzled me. Why did this occur? Did the US want to the different?

Searocksandtrees

hi! there's room for more input on this, but meanwhile you can get started on this post from the Traffic section of the FAQ