• Tulsa
  • Changning Country

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.

Changning County, which belongs to Yibin City, Sichuan Province, is located in the southern edge of Sichuan Basin, in the heart of Yibin City, between longitude 10444 °22 "~ 105 °03 °30" east longitude 28 °15 °18 "~ 28 °470048", about 60 kilometers from north to south, 30 kilometers from east to west, an area of 1000.2 square kilometers, forest coverage of 62.8%, and the content of negative oxygen ions in the air can reach up to 47000 per cubic centimeter (Qidonggou). It is a famous hometown of longevity. As of August 24, 2019, Changning County has jurisdiction over 13 towns with a total population of 460400 (2018). There are 9 ethnic groups, including Han, Miao and Yi, among which 28 are over 100 years old, the oldest is 112 years old, and the number of people over 90 years old has reached 1075.
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