Filmmakers and producers moved to Hollywood for a more consistent climate year around, which made it easier to film more consistent shots with weather and outdoor lighting
Studios owned every part of the filmmaking process using vertical integration, meaning they didn’t have to pay any third parties and had more control over everything
The first talking picture was The Jazz Singer released October 6th 1927
Transitioning out of the silent era was an issue for actors as their voices would either not match their onscreen image, or were heavily accented. It also meant the actors could not be vocally directed as the microphones would pick it up
The wall street crash happened in 1929 which caused the great depression. This was great for the cinema industry as it was an escape for people from the horrific life they lived.