Why is popular culture so dominated by California and England?

Because they are very influencial places. However, I wouldn't say that popular culture is influenced by the entire of england. For example, traditionally, England is about country living and if we go right back to the celts, about living with nature. Other countries have come in and influenced England, then people from England and europe went over to America. So, actually, popular culture comes from all races of people. The reason popular culture is dominated by places like London, New York, Calirfornia is because they are supposedly wonderful places and full of rich people that most people look up to.