What determines the capital of a city?

Answer 1

It varies. Some capitals were selected because they were in the middle of the state, and people would have fewer problem getting to a central location. Other capitals were selected because of the biggest city: it was assumed that a large city would be a good choice, since it was the center of population in the state.

Answer 2

It's where the Government is, usually it is the largest city, but not always. Sorry, I have answered for the capital of a country, but I suspect that is what the Q meant....