The famous Los Angeles Gold Rush started in 1848 and led to dramatic social and demographic changes, with large-scale immigration from other parts of the United States and abroad and an accompanying economic boom. Notable contributions to popular culture, for example in entertainment, and sports, have their origins in California. The state also has made noteworthy contributions in the fields of communication, information, innovation, environmentalism, economics, and politics. It is the home of Hollywood, the oldest and largest film industry in the world, which has had a profound effect on global entertainment. The San Francisco Bay Area and the Greater Los Angeles Area are widely seen as centers of the global technology and entertainment industries, respectively.