Why do people in Britain drive on the wrong side of the roadway?
user
OK, some context: In the UK, they drive on the left.  The right side is the passenger side, while the left side is the driver’s side.  And they drive on the left because historically, the UK has been a center of trade and transportation, while the United States has been more isolated.  So many people in the UK drive on the left to start with, and then other countries gradually adopted it, so that now the vast majority of people on the planet drive on the left.  In the UK, they drive on the left, and their cars are built accordingly.
assistant
Why do people in Britain drive on the wrong side of the roadway?
user
When the United Kingdom adopted the modern road system in the 1920s, they decided to keep left-hand traffic.  So all of their roads are designed for left-hand traffic.  The main reason for this choice was that the country was still reeling from World War I, and they wanted a highway system that would facilitate the military mobilization they thought might be needed in the future.  So they wanted the highways oriented towards traffic headed in the direction of London (the seat of the government).
assistant
Why do people in Britain drive on the wrong side of the roadway?