Hollywood became the center of american film production in part because of

of the monopoly of the most powerful film company of the time the Motion Picture Patents Company that monopolized all patents, preventing competitors from making films from New York to Chicago (which in 1907) was the cinematographic center of America. Independent producers began to relocate with their troupe in California because the MPPC monopoly was not legally valid. And secondly Hollywood was chosen for the various environments that could be clearly used as "external" for the various cinematic strands.

sorry i cant