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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.

Ningxia Hui Autonomous region, referred to as Ning, is one of China's five autonomous regions, the capital of Yinchuan. It is located in the inland area of northwest China, bounded by latitude 35 °14 & # 39 in north latitude and longitude 104o 17 & # 39 in east longitude, bordering Shaanxi in the east, Inner Mongolia in the west and Inner Mongolia in the north and Gansu in the south. Ningxia Hui Autonomous region has a total area of 66400 square kilometers. The topography of Ningxia is gradually inclined from southwest to northeast, with numerous hills and gullies. The topography is divided into three major plates: the Yellow River diversion irrigation area in the north, the arid zone in the middle and the mountain area in the south. Ningxia is located in the Yellow River system, the terrain is high in the south and low in the north, showing a ladder-like decline, the whole region belongs to temperate continental arid and semi-arid climate. By the end of 2018, Ningxia Hui Autonomous region had jurisdiction over 5 prefecture-level cities, 9 municipal districts,
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