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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.

Zhangjiachuan Hui Autonomous County belongs to Tianshui City, Gansu Province, located in the southeast of Gansu Province, northeast of Tianshui City, bordered by Longxian County, Shaanxi Province in the east, Qingshui County in the south, Qinan County in the west, and Huating and Zhuanglang counties in the north. With a total area of 1311.8 square kilometers (2010) and a population of 332496 (2011), e-commerce has entered the rural comprehensive demonstration county. In 2011, Zhangjiachuan achieved a GDP of 1.76576 billion yuan. Zhangjiachuan Hui Autonomous County has Guanshan Qinjiayuan scenery, wheat accumulation, Huaguoshan Shuiliang Cave and other famous scenic spots. In December 2019, Lintan County won the seventh batch of national unity and progress demonstration areas (units).
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