Sacramento ( SAK-rə-MEN-toh; Spanish: [sakɾaˈmento]) is the capital city of the U.S. state of California and the seat of Sacramento County. Located at the confluence of the Sacramento River and the American River in Northern California's Sacramento Valley, Sacramento's estimated 2018 population of 501,334 makes it the sixth-largest city in California and the 9th largest capital in the United States. Sacramento is the seat of the California Assembly, the Governor of California, and Supreme Court of California, making it the state's political center and a hub for lobbying and think tanks. Sacramento is also the cultural and economic core of the Sacramento metropolitan area, which had 2010 population of 2,414,783, making it the fifth largest in California.
Sacramento is the fastest-growing major city in California, owing to its status as a notable financial center on the West Coast and as a major educational hub, home of Sacramento State University and University of California, Davis. Similarly, Sacramento is a major center for the California healthcare industry, as the seat of Sutter Health, the world-renowned UC Davis Medical Center, and the UC Davis School of Medicine, and notable tourist destination in California, as the site of The California Museum, the Crocker Art Museum, California Hall of Fame, the California State Capitol Museum, and the Old Sacramento State Historic Park. Sacramento is known for its evolving contemporary culture, dubbed the most "hipster city" in California. In 2002, the Harvard University Civil Rights Project conducted for Time magazine named Sacramento "America's Most Diverse City".
Before the arrival of the Spanish, the area was inhabited by the Nisenan people indigenous peoples of California. Spanish cavalryman Gabriel Moraga surveyed and named the Rio del Santísimo Sacramento (Sacramento River) in 1808, after the Blessed Sacrament, referring to the Eucharist in the Catholic Church. In 1839, Juan Bautista Alvarado, Mexican governor of Alta California granted the responsibility of colonizing the Sacramento Valley to Swiss-born, Mexican citizen John Augustus Sutter, who subsequently established Sutter's Fort and the settlement at the Rancho Nueva Helvetia. Following the American Conquest of California and the 1848 Treaty of Guadalupe-Hidalgo, the waterfront developed by Sutter began to be developed and incorporated in 1850 as the City of Sacramento. As a result of the California Gold Rush, Sacramento became a major commercial center and distribution point for Northern California, serving as the terminus for the Pony Express and the First Transcontinental Railroad.