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Tulsa (/ˈtʌlsə/) is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States. The population was 413,066 as of the 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, a region with 1,023,988 residents. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, with urban development extending into Osage, Rogers, and Wagoner counties.

Tulsa was settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe and most of Tulsa is still part of the territory of the Muscogee (Creek) Nation.[a]

Historically, a robust energy sector fueled Tulsa's economy; however, today the city has diversified and leading sectors include finance, aviation, telecommunications and technology. Two institutions of higher education within the city have sports teams at the NCAA Division I level: Oral Roberts University and the University of Tulsa. As well, the University of Oklahoma has a secondary campus at the Tulsa Schusterman Center, and Oklahoma State University has a secondary campus located in downtown Tulsa. For most of the 20th century, the city held the nickname "Oil Capital of the World" and played a major role as one of the most important hubs for the American oil industry.

Shaanxi, referred to as "Shaanxi" or "Qin", the provincial administrative region of the people's Republic of China, the provincial capital Xi'an, is located in the hinterland of China, the middle reaches of the Yellow River, Shanxi and Henan to the east, Ningxia and Gansu to the west, Sichuan, Chongqing and Hubei to the south and Inner Mongolia to the north, between longitude 105 °29 and latitude 31 °42, with a total area of 205600 square kilometers. China's longitude and latitude reference point, geodetic origin, and Beijing time National time Service Center are located in the province. The topography of Shaanxi Province is high in the north and low in the middle, and is composed of plateaus, mountains, plains and basins, among which the Loess Plateau accounts for 40% of the province's land area, straddling the two major river systems of the Yellow River and the Yangtze River, and across three climatic belts. The Great Wall in northern Shaanxi belongs to the mid-temperate monsoon climate, Guanzhong and
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