Independent film studios fled Thomas Edison's trusts and lawsuits in New York in the early 20th century, relocating to Los Angeles for its sunny weather, inexpensive property, and varied locations. As the film industry flourished in LA, Hollywood became the center of movie production in the US, establishing the studio system to ensure quality and costs were controlled. Over time, major studios like MGM, Paramount, and Warner Bros led the Hollywood studio system, which grew to become the world's dominant film industry as European cinema struggled after World War I.