Why are steering wheels on the right side of a boat?

BITD boats didn't have rudders in the center, but side-hung rudders.

For some reason, it became tradition to "always" put the rudder on the right side of the boat.

"Right" on boats is called "starboard" - the side where the steering board was.

When entering a port, people tied up with the rudder facing OUT, to avoid damage. So left became "port", from portside.

Staying with tradition from the old side-hung rudders, steering is done from the right, starboard side of the boat.