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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.

Zhengning County, which belongs to Qingyang City, Gansu Province, is located in the southeast of Qingyang City, Gansu Province, at the west foot of Ziwuling, east and Huangling County of Shaanxi Province, bounded by Ziwuling County in the east, Xunyi County in Shaanxi Province in the south, Bin County in Shaanxi Province in the southwest, Jinghe County in Shaanxi Province in the west and Ning County in Gansu Province in the north, with geographical coordinates of 35 °14 °40 "- 35 °36 °18" N and 107 °56 °20 "- 108 °38 °08" E The county covers an area of 1330.9648 square kilometers. Zhengning County has jurisdiction over 4 towns and 6 townships (at the end of 2011), with 7 communities, 94 villages and 677 village groups, with a total population of 239600 (2012). In 2012, Zhengning County achieved a gross domestic product (GDP) of 2.134 billion yuan, compared with 201.
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