Why were the five major italian states of rome, venice, milan, florence, and naples able to so thoroughly dominate italian culture during the renaissance?

The five major Italian states - Rome, Venice, Milan, Florence, and Naples are able to so thoroughly dominate Italian culture during the renaissance because it is where most of the prominent people lived. They became a master in their field of work or career. They flourished and develop their skills in those states that made these states boom.