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San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

Quanjiao County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province, on the south side of the Jianghuai Watershed, between Hefei, the capital of Anhui Province and Nanjing, the capital of Jiangsu Province. Quanjiao County is located in the Jianghuai hilly area, with low mountains and hills in the northwest. The east and south are corrugated plains alternating with hills and hills, with sporadic distribution of residual hills and a subtropical monsoon climate with a total area of 1568 square kilometers. Quanjiao County was first built in the Western Han Dynasty, the name of the county evolved from the ancient country. Legend has it that the ancient Gao Yang established Gujiao Kingdom in Jiaolingshan (also known as Busan, in today's city). In the Spring and Autumn period, it was Chu Jiaoyi, and then Quanshi lived. Han Dynasty set up governance in Gujiaoyi County, hence the name Quanjiao County. Quanjiao is the cultural hometown of Chongwen and heavy education, which has given birth to many local scholars, the most famous of which is Wu Jingzi, the author of the Outer History of Scholars, which created a precedent of Chinese satirical novels. Quanjiao County
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