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Sacramento (/ˌsækrəˈmɛntoʊ/ SAK-rə-MEN-toh; Spanish: [sakɾaˈmento], Spanish for ''sacrament'') is the capital city of the U.S. state of California and the seat and largest city of Sacramento County. Located at the confluence of the Sacramento and American River in Northern California's Sacramento Valley, Sacramento's 2020 population of 524,943 makes it the sixth-largest city in California and the ninth-largest capital in the United States. Sacramento is the seat of the California Legislature and the Governor of California, making it the state's political center and a hub for lobbying and think tanks. It features the California State Capitol Museum.

Sacramento is also the cultural and economic core of the Greater Sacramento area, which at the 2020 census had a population of 2,680,831, the fourth-largest metropolitan area in California.

Before the arrival of the Spanish, the area was inhabited by the historic Nisenan, Maidu, and other indigenous peoples of California. Spanish cavalryman Gabriel Moraga surveyed and named the Río del Santísimo Sacramento (Sacramento River) in 1808, after the Blessed Sacrament. 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.

Lu'an is a prefecture-level city in Anhui Province. Located in the west of Anhui Province, known as "Gaocheng" for short, located between the Yangtze River and the Huaihe River, the northern foot of the Dabie Mountains, the west wing of the Yangtze River Delta economic zone, the geographical meaning of "West Anhui" specifically refers to Liu'an. Liu'an is located in Jianghuai, with Wu Yue in the east, Jingchu in the west and the Central Plains in the north; the terrain is high in the southwest and flat in the northeast, showing a trapezoidal distribution; it belongs to the transition zone from the north subtropical zone to the warm temperate zone, with significant monsoons and four distinct seasons. In 2017, the city has a total area of 15451 square kilometers and a registered population of 5.882 million. It has jurisdiction over 3 districts and 4 counties. The name of Lu'an began with Emperor Wu of the Han Dynasty, taking the first words of six counties in Hengshan, Anfeng and Anfeng, and other Hengshan countries as Lu'an, with the meaning of "peace in six places, never rebellion". Because Shun Feng Gao Tao in six, so later generations called Liu'an
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