• Tulsa
  • Huachi

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.

Huachi County, which belongs to Qingyang City, Gansu Province, is located in the east of Gansu Province and northeast of Qingyang City, bordering Zhidan, Wuqi and Dingbian in Shaanxi Province in the northeast, and Huanxian, Qingcheng and Heshui in the southwest. It is located between longitude 107 °29 "108 °33" east and latitude 36 °07 "36 °51 'north. It has jurisdiction over 4 towns and 11 townships, with a total land area of 3776 square kilometers and a total population of 138000 (resident population in 2016). In 2013, the GDP of Huachi County reached 9.2 billion yuan. Huachi County has been awarded as "National Scientific and technological Progress County", "National Advanced County in surveying and Mapping Management", "Provincial double support Model County", "Provincial Greening Model County", "Provincial civilized County" and "Provincial Health County" by the state and province. December 2016, listed as the third batch
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