Bay Area
The San Francisco Bay Area is the cultural and economic center of Northern California. The region surrounds San Francisco Bay, and is anchored by Oakland, San Francisco, and San Jose. It is commonly known as the Bay Area, or simply the Bay. With a population of over nine million people, the Bay Area is the second-largest combined statistical area in California and the fifth-largest in the United States. The Bay Area houses the global center of the technology industry, and is also a nexus for healthcare, education, finance, shipping, and tourism. The region is known for its natural beauty, cultural landmarks, diverse communities, and affluence.
The Association of Bay Area Governments defines the Bay Area as including the nine counties that border the estuaries of San Francisco Bay, San Pablo Bay, and Suisun Bay: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco. The U.S. Census Bureau includes the Central Coast counties of Santa Cruz and San Benito, as well as the Central Valley counties of San Joaquin, Merced, and Stanislaus in its broader definition.
The earliest archaeological evidence of settlement in the Bay Area dates back to 8,000–10,000 BC. The oral tradition of the Ohlone and Miwok people suggests they have been living in the Bay Area for several hundreds if not thousands of years. The Spanish Empire claimed the area beginning in the early period of Spanish colonization of the Americas. The earliest Spanish exploration of the Bay Area took place in 1769. The Mexican government controlled the area from 1821 until the 1848 Treaty of Guadalupe Hidalgo. Also in 1848, James W. Marshall discovered gold in nearby mountains, resulting in explosive immigration to the area and the precipitous decline of the Native population. The California gold rush brought rapid growth to the region. California was admitted as the 31st state in 1850. A major earthquake and fire leveled much of San Francisco in 1906. During World War II, the Bay Area played a major role in America's war effort in the Asiatic-Pacific Theater, with Fort Mason commanding a primary embarkation point for American forces. Since then, the Bay Area has developed unique local genres in art and music and established itself as a hotbed of progressive politics.
The postwar Bay Area saw large growth in the financial and technology industries, creating one of the most economically productive regions in the United States and the world, with a gross domestic product of over $1.3 trillion in 2024, higher than all but 17 countries. In 2018, it was home to the third-highest concentration of Fortune 500 companies in the United States. As of 2020, the Bay Area ranked second by GDP per capita ($131,082) across all metropolitan areas in OECD countries.
The Bay Area's population is ethnically diverse: roughly three-fifths of the region's residents are Hispanic/Latino, Asian, African/Black, or Pacific Islander, all of whom have a significant presence throughout the region. Most of the remaining two-fifths of the population is non-Hispanic White American.
San Francisco Bay is one of California's most ecologically sensitive habitats, providing important ecosystem services such as filtering the pollutants and sediments from rivers and supporting a number of endangered species. In addition, the Bay Area is known for its stands of coast redwoods, many of which are protected in state and county parks. The region is additionally known for the complexity of its landforms, the result of millions of years of tectonic plate movements. Because the Bay Area is crossed by six major faults, the region is particularly exposed to hazards presented by large earthquakes. The region's climate is temperate and conducive to outdoor recreational and athletic activities such as hiking, running, and cycling.
The Bay Area is host to teams in each of the five largest North American men's professional sports leagues and one of the most extensive public transportation systems in the United States. It is also home to numerous higher education institutions, including research universities such as the University of California, Berkeley, and Stanford University, the latter known for helping to create Silicon Valley.
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