California
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California () is a state in the Western United States that lies on the Pacific Coast. It borders Oregon to the north, and Nevada and Arizona to the east; it also shares an international border with the Mexican state of Baja California to the south. With over 39 million residents across an area of 163,696 square miles (423,970 km2), it is the largest U . state by population and third-largest by area. Prior to European colonization, California was one of the most culturally and linguistically diverse areas in pre-Columbian North America. European exploration in the 16th and 17th centuries led to the colonization by the Spanish Empire. The area became a part of Mexico in 1821, as a result of its successful war for independence. Following the U . conquest of California, part of the Mexican-American War, California was ceded to the United States in 1848. The California gold rush started in 1848 and led to social and demographic changes, including the California genocide. It organized itself and was admitted as the 31st state in 1850 as a free state, following the Compromise of 1850. Despite declining populations since 2020, the Greater Los Angeles, Inland Empire, and San Francisco Bay areas are the nation's second, twelfth, and thirteenth most populous metropolitan areas, with Los Angeles over 12 million residents, and the Inland Empire and Bay Area, each having 4 million residents. Los Angeles is the state's most populous city and is ranked second in population in the nation. California's capital is Sacramento. Part of the Californias region of North America, the state's diverse geography ranges from the Pacific Coast and metropolitan areas in the west to the Sierra Nevada mountains in the east, and from the redwood and Douglas fir forests in the northwest to the Mojave Desert in the southeast. Two-thirds of the nation's earthquake risk lies in California. The Central Valley, a fertile agricultural area, dominates the state's center. The large size of the state results in climates that vary from moist temperate rainforest in the north to arid desert in the interior, as well as snowy alpine in the mountains. Droughts and wildfires are an ongoing issue, while atmospheric rivers have become increasingly prevalent, leading to intense flooding events—especially in the winter.
The economy of California is the largest of any U . state, with an estimated 2025 gross state product of $4 trillion as of Q3 2025. It is also the world's largest sub-national economy and, if it were an independent country, would be the fourth-largest economy in the world (behind Germany and ahead of Japan) by nominal GDP as of 2025. The state's agricultural industry leads the nation in output, fueled by its production of dairy, almonds, and grapes. Despite heavy reliance on seaborne foreign crude oil, California also refines some of its own oil, primarily drilled from Kern County. With the busiest port in the country (Los Angeles), California plays a pivotal role in the global supply chain, hauling in about 40% of goods imported to the US. Notable contributions to popular culture, ranging from entertainment, sports, music, and fashion, have their origins in California. Despite an exodus of filmmaking from California, Hollywood continues to be an important center of the U . film industry, one of the oldest and largest film industries in the world; profoundly influencing global entertainment since the 1920s. The San Francisco Bay Area's Silicon Valley is the center of the global technology industry.