California is a state on the west coast of the United States. With over 39.3million residents across a total area of approximately 163,696 square miles (423,970 km²), it is the most populous and the third-largest U.S. state by area. It is also the most populated subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento is the state's capital, while Los Angeles is the most populous city in the state and the second most populous city in the country (after New York City). Los Angeles County is the country's most populous, while San Bernardino County is the largest county by area in the country. San Francisco, which is both a city and county, is the second most densely populated major city in the country (after New York City) and the fifth most densely populated county in the country, behind four of New York City's five boroughs.

The economy of California, with a gross state product of $3.2trillion as of 2019, is the largest sub-national economy in the world. If it were a country, it would be the 37th most populous country and the fifth largest economy . The Greater Los Angeles area and the San Francisco Bay Area are the nation's second- and third-largest urban economies ($1.0trillion and $0.5trillion respectively ), after the New York metropolitan area ($1.8trillion). The San Francisco Bay Area Combined Statistical Area had the nation's highest gross domestic product per capita ($106,757) among large primary statistical areas in 2018, and is home to four of the world's 10 largest companies by market capitalization and four of the world's 10 richest people.

What is now California was first settled by various Native Californian tribes before being explored by a number of Europeans during the 16th and 17th centuries. The Spanish Empire then claimed and colonized it. In 1804, it was included in Alta California province within the Viceroyalty of New Spain. The area became a part of Mexico in 1821, following its successful war for independence, but was ceded to the United States in 1848 after the Mexican-American War. The western portion of Alta California was then organized and admitted as the 31st state on September 9, 1850, following the Compromise of 1850. The California Gold Rush started in 1848 and led to dramatic social and demographic changes, with large-scale emigration from the east and abroad with an accompanying economic boom.

Today, California is considered a worldwide trendsetter in popular culture, including the areas of entertainment, sports, 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. As a result of the state's diversity and migration, California integrates foods, languages, and traditions from other areas across the country and around the globe. It is considered the origin of the hippie counterculture, beach and car culture, the Internet, and the personal computer, among other innovations. The San Francisco Bay Area and the Greater Los Angeles Area are widely seen as centers of the global technology and entertainment industries, respectively. California's economy is very diverse: 58% of it is based on finance, government, real estate services, technology, and professional, scientific, and technical business services. Although it accounts for only 1.5% of the state's economy, California's agriculture industry has the highest output of any U.S. state. (Full article...)